diff --git a/llvm/include/llvm/CodeGen/SelectionDAGNodes.h b/llvm/include/llvm/CodeGen/SelectionDAGNodes.h
@@ -741,11 +741,9 @@ END_TWO_BYTE_PACK()
     using reference = value_type &;
 
     use_iterator() = default;
-    use_iterator(const use_iterator &I) : Op(I.Op) {}
+    use_iterator(const use_iterator &I) = default;
 
-    bool operator==(const use_iterator &x) const {
-      return Op == x.Op;
-    }
+    bool operator==(const use_iterator &x) const { return Op == x.Op; }
     bool operator!=(const use_iterator &x) const {
       return !operator==(x);
     }

diff --git a/llvm/include/llvm/DebugInfo/DWARF/DWARFDebugFrame.h b/llvm/include/llvm/DebugInfo/DWARF/DWARFDebugFrame.h
@@ -535,7 +535,7 @@ class FrameEntry {
       : Kind(K), IsDWARF64(IsDWARF64), Offset(Offset), Length(Length),
         CFIs(CodeAlign, DataAlign, Arch) {}
 
-  virtual ~FrameEntry() {}
+  virtual ~FrameEntry() = default;
 
   FrameKind getKind() const { return Kind; }
   uint64_t getOffset() const { return Offset; }

diff --git a/llvm/include/llvm/DebugInfo/GSYM/StringTable.h b/llvm/include/llvm/DebugInfo/GSYM/StringTable.h
@@ -20,7 +20,7 @@ namespace gsym {
 /// string at offset zero. Strings must be UTF8 NULL terminated strings.
 struct StringTable {
   StringRef Data;
-  StringTable() {}
+  StringTable() = default;
   StringTable(StringRef D) : Data(D) {}
   StringRef operator[](size_t Offset) const { return getString(Offset); }
   StringRef getString(uint32_t Offset) const {

diff --git a/llvm/include/llvm/DebugInfo/Symbolize/DIPrinter.h b/llvm/include/llvm/DebugInfo/Symbolize/DIPrinter.h
@@ -39,8 +39,8 @@ struct Request {
 
 class DIPrinter {
 public:
-  DIPrinter() {}
-  virtual ~DIPrinter() {}
+  DIPrinter() = default;
+  virtual ~DIPrinter() = default;
 
   virtual void print(const Request &Request, const DILineInfo &Info) = 0;
   virtual void print(const Request &Request, const DIInliningInfo &Info) = 0;

diff --git a/llvm/include/llvm/ExecutionEngine/JITLink/JITLink.h b/llvm/include/llvm/ExecutionEngine/JITLink/JITLink.h
@@ -1636,7 +1636,7 @@ using AsyncLookupResult = DenseMap<StringRef, JITEvaluatedSymbol>;
 /// or an error if resolution failed.
 class JITLinkAsyncLookupContinuation {
 public:
-  virtual ~JITLinkAsyncLookupContinuation() {}
+  virtual ~JITLinkAsyncLookupContinuation() = default;
   virtual void run(Expected<AsyncLookupResult> LR) = 0;
 
 private:

diff --git a/llvm/include/llvm/ExecutionEngine/Orc/Core.h b/llvm/include/llvm/ExecutionEngine/Orc/Core.h
@@ -686,7 +686,7 @@ class MaterializationUnit {
   MaterializationUnit(Interface I)
       : SymbolFlags(std::move(I.SymbolFlags)),
         InitSymbol(std::move(I.InitSymbol)) {}
-  virtual ~MaterializationUnit() {}
+  virtual ~MaterializationUnit() = default;
 
   /// Return the name of this materialization unit. Useful for debugging
   /// output.

diff --git a/llvm/include/llvm/ExecutionEngine/Orc/DebuggerSupportPlugin.h b/llvm/include/llvm/ExecutionEngine/Orc/DebuggerSupportPlugin.h
@@ -29,7 +29,7 @@ class GDBJITDebugInfoRegistrationPlugin : public ObjectLinkingLayer::Plugin {
 public:
   class DebugSectionSynthesizer {
   public:
-    virtual ~DebugSectionSynthesizer() {}
+    virtual ~DebugSectionSynthesizer() = default;
     virtual Error startSynthesis() = 0;
     virtual Error completeSynthesisAndRegister() = 0;
   };

diff --git a/llvm/include/llvm/ExecutionEngine/Orc/EPCDebugObjectRegistrar.h b/llvm/include/llvm/ExecutionEngine/Orc/EPCDebugObjectRegistrar.h
@@ -34,7 +34,7 @@ class ExecutionSession;
 class DebugObjectRegistrar {
 public:
   virtual Error registerDebugObject(ExecutorAddrRange TargetMem) = 0;
-  virtual ~DebugObjectRegistrar() {}
+  virtual ~DebugObjectRegistrar() = default;
 };
 
 /// Use ExecutorProcessControl to register debug objects locally or in a remote

diff --git a/llvm/include/llvm/ExecutionEngine/Orc/TaskDispatch.h b/llvm/include/llvm/ExecutionEngine/Orc/TaskDispatch.h
@@ -35,7 +35,7 @@ class Task : public RTTIExtends<Task, RTTIRoot> {
 public:
   static char ID;
 
-  virtual ~Task() {}
+  virtual ~Task() = default;
 
   /// Description of the task to be performed. Used for logging.
   virtual void printDescription(raw_ostream &OS) = 0;

diff --git a/llvm/include/llvm/IR/PassInstrumentation.h b/llvm/include/llvm/IR/PassInstrumentation.h
@@ -86,7 +86,7 @@ class PassInstrumentationCallbacks {
   using AnalysesClearedFunc = void(StringRef);
 
 public:
-  PassInstrumentationCallbacks() {}
+  PassInstrumentationCallbacks() = default;
 
   /// Copying PassInstrumentationCallbacks is not intended.
   PassInstrumentationCallbacks(const PassInstrumentationCallbacks &) = delete;

diff --git a/llvm/include/llvm/IR/PassManager.h b/llvm/include/llvm/IR/PassManager.h
@@ -473,7 +473,7 @@ class PassManager : public PassInfoMixin<
                         PassManager<IRUnitT, AnalysisManagerT, ExtraArgTs...>> {
 public:
   /// Construct a pass manager.
-  explicit PassManager() {}
+  explicit PassManager() = default;
 
   // FIXME: These are equivalent to the default move constructor/move
   // assignment. However, using = default triggers linker errors due to the

diff --git a/llvm/include/llvm/IR/PassManagerImpl.h b/llvm/include/llvm/IR/PassManagerImpl.h
@@ -20,7 +20,7 @@
 namespace llvm {
 
 template <typename IRUnitT, typename... ExtraArgTs>
-inline AnalysisManager<IRUnitT, ExtraArgTs...>::AnalysisManager() {}
+inline AnalysisManager<IRUnitT, ExtraArgTs...>::AnalysisManager() = default;
 
 template <typename IRUnitT, typename... ExtraArgTs>
 inline AnalysisManager<IRUnitT, ExtraArgTs...>::AnalysisManager(

diff --git a/llvm/include/llvm/IR/SafepointIRVerifier.h b/llvm/include/llvm/IR/SafepointIRVerifier.h
@@ -37,7 +37,7 @@ FunctionPass *createSafepointIRVerifierPass();
 class SafepointIRVerifierPass : public PassInfoMixin<SafepointIRVerifierPass> {
 
 public:
-  explicit SafepointIRVerifierPass() {}
+  explicit SafepointIRVerifierPass() = default;
 
   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
 };

diff --git a/llvm/include/llvm/InterfaceStub/IFSStub.h b/llvm/include/llvm/InterfaceStub/IFSStub.h
@@ -95,7 +95,7 @@ struct IFSStub {
   std::vector<std::string> NeededLibs;
   std::vector<IFSSymbol> Symbols;
 
-  IFSStub() {}
+  IFSStub() = default;
   IFSStub(const IFSStub &Stub);
   IFSStub(IFSStub &&Stub);
 };
@@ -106,7 +106,7 @@ struct IFSStub {
 // This class makes it possible to map a second traits so the same data
 // structure can be used for 2 different yaml schema.
 struct IFSStubTriple : IFSStub {
-  IFSStubTriple() {}
+  IFSStubTriple() = default;
   IFSStubTriple(const IFSStub &Stub);
   IFSStubTriple(const IFSStubTriple &Stub);
   IFSStubTriple(IFSStubTriple &&Stub);

diff --git a/llvm/include/llvm/LineEditor/LineEditor.h b/llvm/include/llvm/LineEditor/LineEditor.h
@@ -64,7 +64,7 @@ class LineEditor {
 
   /// A possible completion at a given cursor position.
   struct Completion {
-    Completion() {}
+    Completion() = default;
     Completion(const std::string &TypedText, const std::string &DisplayText)
         : TypedText(TypedText), DisplayText(DisplayText) {}
 

diff --git a/llvm/include/llvm/MC/MCPseudoProbe.h b/llvm/include/llvm/MC/MCPseudoProbe.h
@@ -268,7 +268,8 @@ class MCDecodedPseudoProbeInlineTree
   // Used for decoding
   uint32_t ChildrenToProcess = 0;
 
-  MCDecodedPseudoProbeInlineTree(){};
+  MCDecodedPseudoProbeInlineTree() = default;
+  ;
   MCDecodedPseudoProbeInlineTree(const InlineSite &Site) : ISite(Site){};
 
   // Return false if it's a dummy inline site

diff --git a/llvm/include/llvm/MCA/CustomBehaviour.h b/llvm/include/llvm/MCA/CustomBehaviour.h
@@ -41,7 +41,7 @@ class InstrPostProcess {
   InstrPostProcess(const MCSubtargetInfo &STI, const MCInstrInfo &MCII)
       : STI(STI), MCII(MCII) {}
 
-  virtual ~InstrPostProcess() {}
+  virtual ~InstrPostProcess() = default;
 
   /// This method can be overriden by targets to modify the mca::Instruction
   /// object after it has been lowered from the MCInst.

diff --git a/llvm/include/llvm/MCA/HWEventListener.h b/llvm/include/llvm/MCA/HWEventListener.h
@@ -176,7 +176,7 @@ class HWEventListener {
   virtual void onReleasedBuffers(const InstRef &Inst,
                                  ArrayRef<unsigned> Buffers) {}
 
-  virtual ~HWEventListener() {}
+  virtual ~HWEventListener() = default;
 
 private:
   virtual void anchor();

diff --git a/llvm/include/llvm/MCA/HardwareUnits/ResourceManager.h b/llvm/include/llvm/MCA/HardwareUnits/ResourceManager.h
@@ -49,7 +49,7 @@ class ResourceStrategy {
   ResourceStrategy &operator=(const ResourceStrategy &) = delete;
 
 public:
-  ResourceStrategy() {}
+  ResourceStrategy() = default;
   virtual ~ResourceStrategy();
 
   /// Selects a processor resource unit from a ReadyMask.

diff --git a/llvm/include/llvm/Object/Archive.h b/llvm/include/llvm/Object/Archive.h
@@ -45,7 +45,7 @@ class AbstractArchiveMemberHeader {
 public:
   friend class Archive;
   virtual std::unique_ptr<AbstractArchiveMemberHeader> clone() const = 0;
-  virtual ~AbstractArchiveMemberHeader(){};
+  virtual ~AbstractArchiveMemberHeader() = default;
 
   /// Get the name without looking up long names.
   virtual Expected<StringRef> getRawName() const = 0;

diff --git a/llvm/include/llvm/Object/ELFTypes.h b/llvm/include/llvm/Object/ELFTypes.h
@@ -699,7 +699,7 @@ template <class ELFT> class Elf_Note_Iterator_Impl {
     }
   }
 
-  Elf_Note_Iterator_Impl() {}
+  Elf_Note_Iterator_Impl() = default;
   explicit Elf_Note_Iterator_Impl(Error &Err) : Err(&Err) {}
   Elf_Note_Iterator_Impl(const uint8_t *Start, size_t Size, Error &Err)
       : RemainingSize(Size), Err(&Err) {

diff --git a/llvm/include/llvm/Passes/StandardInstrumentations.h b/llvm/include/llvm/Passes/StandardInstrumentations.h
@@ -75,7 +75,7 @@ class OptNoneInstrumentation {
 
 class OptBisectInstrumentation {
 public:
-  OptBisectInstrumentation() {}
+  OptBisectInstrumentation() = default;
   void registerCallbacks(PassInstrumentationCallbacks &PIC);
 };
 

diff --git a/llvm/include/llvm/ProfileData/InstrProfCorrelator.h b/llvm/include/llvm/ProfileData/InstrProfCorrelator.h
@@ -55,7 +55,7 @@ class InstrProfCorrelator {
 
   enum InstrProfCorrelatorKind { CK_32Bit, CK_64Bit };
   InstrProfCorrelatorKind getKind() const { return Kind; }
-  virtual ~InstrProfCorrelator() {}
+  virtual ~InstrProfCorrelator() = default;
 
 protected:
   struct Context {

diff --git a/llvm/include/llvm/ProfileData/InstrProfReader.h b/llvm/include/llvm/ProfileData/InstrProfReader.h
@@ -560,7 +560,7 @@ class InstrProfReaderIndex : public InstrProfReaderIndexBase {
 /// Name matcher supporting fuzzy matching of symbol names to names in profiles.
 class InstrProfReaderRemapper {
 public:
-  virtual ~InstrProfReaderRemapper() {}
+  virtual ~InstrProfReaderRemapper() = default;
   virtual Error populateRemappings() { return Error::success(); }
   virtual Error getRecords(StringRef FuncName,
                            ArrayRef<NamedInstrProfRecord> &Data) = 0;

diff --git a/llvm/include/llvm/Remarks/RemarkParser.h b/llvm/include/llvm/Remarks/RemarkParser.h
@@ -27,7 +27,7 @@ class EndOfFileError : public ErrorInfo<EndOfFileError> {
 public:
   static char ID;
 
-  EndOfFileError() {}
+  EndOfFileError() = default;
 
   void log(raw_ostream &OS) const override { OS << "End of file reached."; }
   std::error_code convertToErrorCode() const override {

diff --git a/llvm/include/llvm/Support/BinaryStreamReader.h b/llvm/include/llvm/Support/BinaryStreamReader.h
@@ -35,16 +35,11 @@ class BinaryStreamReader {
                               llvm::support::endianness Endian);
   explicit BinaryStreamReader(StringRef Data, llvm::support::endianness Endian);
 
-  BinaryStreamReader(const BinaryStreamReader &Other)
-      : Stream(Other.Stream), Offset(Other.Offset) {}
+  BinaryStreamReader(const BinaryStreamReader &Other) = default;
 
-  BinaryStreamReader &operator=(const BinaryStreamReader &Other) {
-    Stream = Other.Stream;
-    Offset = Other.Offset;
-    return *this;
-  }
+  BinaryStreamReader &operator=(const BinaryStreamReader &Other) = default;
 
-  virtual ~BinaryStreamReader() {}
+  virtual ~BinaryStreamReader() = default;
 
   /// Read as much as possible from the underlying string at the current offset
   /// without invoking a copy, and set \p Buffer to the resulting data slice.

diff --git a/llvm/include/llvm/Support/BinaryStreamWriter.h b/llvm/include/llvm/Support/BinaryStreamWriter.h
@@ -35,16 +35,11 @@ class BinaryStreamWriter {
   explicit BinaryStreamWriter(MutableArrayRef<uint8_t> Data,
                               llvm::support::endianness Endian);
 
-  BinaryStreamWriter(const BinaryStreamWriter &Other)
-      : Stream(Other.Stream), Offset(Other.Offset) {}
+  BinaryStreamWriter(const BinaryStreamWriter &Other) = default;
 
-  BinaryStreamWriter &operator=(const BinaryStreamWriter &Other) {
-    Stream = Other.Stream;
-    Offset = Other.Offset;
-    return *this;
-  }
+  BinaryStreamWriter &operator=(const BinaryStreamWriter &Other) = default;
 
-  virtual ~BinaryStreamWriter() {}
+  virtual ~BinaryStreamWriter() = default;
 
   /// Write the bytes specified in \p Buffer to the underlying stream.
   /// On success, updates the offset so that subsequent writes will occur

diff --git a/llvm/include/llvm/Support/CommandLine.h b/llvm/include/llvm/Support/CommandLine.h
@@ -877,7 +877,7 @@ class basic_parser_impl { // non-template implementation of basic_parser<t>
 public:
   basic_parser_impl(Option &) {}
 
-  virtual ~basic_parser_impl() {}
+  virtual ~basic_parser_impl() = default;
 
   enum ValueExpected getValueExpectedFlagDefault() const {
     return ValueRequired;

diff --git a/llvm/include/llvm/Support/FileOutputBuffer.h b/llvm/include/llvm/Support/FileOutputBuffer.h
@@ -70,7 +70,7 @@ class FileOutputBuffer {
   /// If this object was previously committed, the destructor just deletes
   /// this object.  If this object was not committed, the destructor
   /// deallocates the buffer and the target file is never written.
-  virtual ~FileOutputBuffer() {}
+  virtual ~FileOutputBuffer() = default;
 
   /// This removes the temporary file (unless it already was committed)
   /// but keeps the memory mapping alive.

diff --git a/llvm/include/llvm/Support/FormatVariadicDetails.h b/llvm/include/llvm/Support/FormatVariadicDetails.h
@@ -24,7 +24,7 @@ class format_adapter {
   virtual void anchor();
 
 protected:
-  virtual ~format_adapter() {}
+  virtual ~format_adapter() = default;
 
 public:
   virtual void format(raw_ostream &S, StringRef Options) = 0;

diff --git a/llvm/include/llvm/Support/GenericDomTree.h b/llvm/include/llvm/Support/GenericDomTree.h
@@ -260,7 +260,7 @@ class DominatorTreeBase {
   friend struct DomTreeBuilder::SemiNCAInfo<DominatorTreeBase>;
 
  public:
-  DominatorTreeBase() {}
+  DominatorTreeBase() = default;
 
   DominatorTreeBase(DominatorTreeBase &&Arg)
       : Roots(std::move(Arg.Roots)),

diff --git a/llvm/include/llvm/Support/KnownBits.h b/llvm/include/llvm/Support/KnownBits.h
@@ -31,7 +31,7 @@ struct KnownBits {
 
 public:
   // Default construct Zero and One.
-  KnownBits() {}
+  KnownBits() = default;
 
   /// Create a known bits object of BitWidth bits initialized to unknown.
   KnownBits(unsigned BitWidth) : Zero(BitWidth, 0), One(BitWidth, 0) {}

diff --git a/llvm/include/llvm/Support/ScopedPrinter.h b/llvm/include/llvm/Support/ScopedPrinter.h
@@ -115,7 +115,7 @@ class ScopedPrinter {
     return SP->getKind() == ScopedPrinterKind::Base;
   }
 
-  virtual ~ScopedPrinter() {}
+  virtual ~ScopedPrinter() = default;
 
   void flush() { OS.flush(); }
 
@@ -792,13 +792,14 @@ class JSONScopedPrinter : public ScopedPrinter {
 struct DelimitedScope {
   DelimitedScope(ScopedPrinter &W) : W(&W) {}
   DelimitedScope() : W(nullptr) {}
-  virtual ~DelimitedScope(){};
+  virtual ~DelimitedScope() = default;
+  ;
   virtual void setPrinter(ScopedPrinter &W) = 0;
   ScopedPrinter *W;
 };
 
 struct DictScope : DelimitedScope {
-  explicit DictScope() {}
+  explicit DictScope() = default;
   explicit DictScope(ScopedPrinter &W) : DelimitedScope(W) { W.objectBegin(); }
 
   DictScope(ScopedPrinter &W, StringRef N) : DelimitedScope(W) {
@@ -817,7 +818,7 @@ struct DictScope : DelimitedScope {
 };
 
 struct ListScope : DelimitedScope {
-  explicit ListScope() {}
+  explicit ListScope() = default;
   explicit ListScope(ScopedPrinter &W) : DelimitedScope(W) { W.arrayBegin(); }
 
   ListScope(ScopedPrinter &W, StringRef N) : DelimitedScope(W) {

diff --git a/llvm/include/llvm/Support/SuffixTree.h b/llvm/include/llvm/Support/SuffixTree.h
@@ -109,7 +109,7 @@ struct SuffixTreeNode {
   SuffixTreeNode(unsigned StartIdx, unsigned *EndIdx, SuffixTreeNode *Link)
       : StartIdx(StartIdx), EndIdx(EndIdx), Link(Link) {}
 
-  SuffixTreeNode() {}
+  SuffixTreeNode() = default;
 };
 
 /// A data structure for fast substring queries.

diff --git a/llvm/include/llvm/Support/Timer.h b/llvm/include/llvm/Support/Timer.h
@@ -106,7 +106,7 @@ class Timer {
   ~Timer();
 
   /// Create an uninitialized timer, client must use 'init'.
-  explicit Timer() {}
+  explicit Timer() = default;
   void init(StringRef TimerName, StringRef TimerDescription);
   void init(StringRef TimerName, StringRef TimerDescription, TimerGroup &tg);
 

diff --git a/llvm/include/llvm/TableGen/Record.h b/llvm/include/llvm/TableGen/Record.h
@@ -2015,7 +2015,7 @@ class Resolver {
 
 public:
   explicit Resolver(Record *CurRec) : CurRec(CurRec) {}
-  virtual ~Resolver() {}
+  virtual ~Resolver() = default;
 
   Record *getCurrentRecord() const { return CurRec; }
 

diff --git a/llvm/include/llvm/Transforms/IPO/Attributor.h b/llvm/include/llvm/Transforms/IPO/Attributor.h
@@ -227,7 +227,7 @@ enum class DepClassTy {
 /// The data structure for the nodes of a dependency graph
 struct AADepGraphNode {
 public:
-  virtual ~AADepGraphNode(){};
+  virtual ~AADepGraphNode() = default;
   using DepTy = PointerIntPair<AADepGraphNode *, 1>;
 
 protected:
@@ -266,8 +266,8 @@ struct AADepGraphNode {
 /// then it means that B depends on A, and when the state of A is
 /// updated, node B should also be updated
 struct AADepGraph {
-  AADepGraph() {}
-  ~AADepGraph() {}
+  AADepGraph() = default;
+  ~AADepGraph() = default;
 
   using DepTy = AADepGraphNode::DepTy;
   static AADepGraphNode *DepGetVal(DepTy &DT) { return DT.getPointer(); }
@@ -844,7 +844,7 @@ struct AnalysisGetter {
   }
 
   AnalysisGetter(FunctionAnalysisManager &FAM) : FAM(&FAM) {}
-  AnalysisGetter() {}
+  AnalysisGetter() = default;
 
 private:
   FunctionAnalysisManager *FAM = nullptr;
@@ -2081,7 +2081,7 @@ struct Attributor {
 /// additional methods to directly modify the state based if needed. See the
 /// class comments for help.
 struct AbstractState {
-  virtual ~AbstractState() {}
+  virtual ~AbstractState() = default;
 
   /// Return if this abstract state is in a valid state. If false, no
   /// information provided should be used.
@@ -2122,7 +2122,7 @@ template <typename base_ty, base_ty BestState, base_ty WorstState>
 struct IntegerStateBase : public AbstractState {
   using base_t = base_ty;
 
-  IntegerStateBase() {}
+  IntegerStateBase() = default;
   IntegerStateBase(base_t Assumed) : Assumed(Assumed) {}
 
   /// Return the best possible representable state.
@@ -2365,7 +2365,7 @@ struct BooleanState : public IntegerStateBase<bool, true, false> {
   using super = IntegerStateBase<bool, true, false>;
   using base_t = IntegerStateBase::base_t;
 
-  BooleanState() {}
+  BooleanState() = default;
   BooleanState(base_t Assumed) : super(Assumed) {}
 
   /// Set the assumed value to \p Value but never below the known one.
@@ -2773,7 +2773,7 @@ struct AbstractAttribute : public IRPosition, public AADepGraphNode {
   AbstractAttribute(const IRPosition &IRP) : IRPosition(IRP) {}
 
   /// Virtual destructor.
-  virtual ~AbstractAttribute() {}
+  virtual ~AbstractAttribute() = default;
 
   /// This function is used to identify if an \p DGN is of type
   /// AbstractAttribute so that the dyn_cast and cast can use such information
@@ -4419,7 +4419,7 @@ class AACallEdgeIterator
 
 struct AACallGraphNode {
   AACallGraphNode(Attributor &A) : A(A) {}
-  virtual ~AACallGraphNode() {}
+  virtual ~AACallGraphNode() = default;
 
   virtual AACallEdgeIterator optimisticEdgesBegin() const = 0;
   virtual AACallEdgeIterator optimisticEdgesEnd() const = 0;
@@ -4485,7 +4485,7 @@ struct AACallEdges : public StateWrapper<BooleanState, AbstractAttribute>,
 // Synthetic root node for the Attributor's internal call graph.
 struct AttributorCallGraph : public AACallGraphNode {
   AttributorCallGraph(Attributor &A) : AACallGraphNode(A) {}
-  virtual ~AttributorCallGraph() {}
+  virtual ~AttributorCallGraph() = default;
 
   AACallEdgeIterator optimisticEdgesBegin() const override {
     return AACallEdgeIterator(A, A.Functions.begin());
@@ -4639,21 +4639,12 @@ struct AAPointerInfo : public AbstractAttribute {
            AccessKind Kind, Type *Ty)
         : LocalI(LocalI), RemoteI(RemoteI), Content(Content), Kind(Kind),
           Ty(Ty) {}
-    Access(const Access &Other)
-        : LocalI(Other.LocalI), RemoteI(Other.RemoteI), Content(Other.Content),
-          Kind(Other.Kind), Ty(Other.Ty) {}
+    Access(const Access &Other) = default;
     Access(const Access &&Other)
         : LocalI(Other.LocalI), RemoteI(Other.RemoteI), Content(Other.Content),
           Kind(Other.Kind), Ty(Other.Ty) {}
 
-    Access &operator=(const Access &Other) {
-      LocalI = Other.LocalI;
-      RemoteI = Other.RemoteI;
-      Content = Other.Content;
-      Kind = Other.Kind;
-      Ty = Other.Ty;
-      return *this;
-    }
+    Access &operator=(const Access &Other) = default;
     bool operator==(const Access &R) const {
       return LocalI == R.LocalI && RemoteI == R.RemoteI &&
              Content == R.Content && Kind == R.Kind;

diff --git a/llvm/include/llvm/Transforms/IPO/IROutliner.h b/llvm/include/llvm/Transforms/IPO/IROutliner.h
@@ -337,11 +337,9 @@ class IROutliner {
   /// be analyzed for similarity.  This is needed as there may be instruction we
   /// can identify as having similarity, but are more complicated to outline.
   struct InstructionAllowed : public InstVisitor<InstructionAllowed, bool> {
-    InstructionAllowed() {}
+    InstructionAllowed() = default;
 
-    bool visitBranchInst(BranchInst &BI) { 
-      return EnableBranches;
-    }
+    bool visitBranchInst(BranchInst &BI) { return EnableBranches; }
     bool visitPHINode(PHINode &PN) { return EnableBranches; }
     // TODO: Handle allocas.
     bool visitAllocaInst(AllocaInst &AI) { return false; }

diff --git a/llvm/include/llvm/Transforms/IPO/SampleProfileProbe.h b/llvm/include/llvm/Transforms/IPO/SampleProfileProbe.h
@@ -154,7 +154,7 @@ class PseudoProbeUpdatePass : public PassInfoMixin<PseudoProbeUpdatePass> {
   void runOnFunction(Function &F, FunctionAnalysisManager &FAM);
 
 public:
-  PseudoProbeUpdatePass() {}
+  PseudoProbeUpdatePass() = default;
   PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);
 };
 

diff --git a/llvm/include/llvm/Transforms/InstCombine/InstCombiner.h b/llvm/include/llvm/Transforms/InstCombine/InstCombiner.h
@@ -93,7 +93,7 @@ class LLVM_LIBRARY_VISIBILITY InstCombiner {
         MinimizeSize(MinimizeSize), AA(AA), AC(AC), TLI(TLI), DT(DT), DL(DL),
         SQ(DL, &TLI, &DT, &AC), ORE(ORE), BFI(BFI), PSI(PSI), LI(LI) {}
 
-  virtual ~InstCombiner() {}
+  virtual ~InstCombiner() = default;
 
   /// Return the source operand of a potentially bitcasted value while
   /// optionally checking if it has one use. If there is no bitcast or the one

diff --git a/llvm/include/llvm/Transforms/Scalar/LoopPassManager.h b/llvm/include/llvm/Transforms/Scalar/LoopPassManager.h
@@ -73,7 +73,7 @@ class PassManager<Loop, LoopAnalysisManager, LoopStandardAnalysisResults &,
           PassManager<Loop, LoopAnalysisManager, LoopStandardAnalysisResults &,
                       LPMUpdater &>> {
 public:
-  explicit PassManager() {}
+  explicit PassManager() = default;
 
   // FIXME: These are equivalent to the default move constructor/move
   // assignment. However, using = default triggers linker errors due to the

diff --git a/llvm/include/llvm/Transforms/Scalar/LowerConstantIntrinsics.h b/llvm/include/llvm/Transforms/Scalar/LowerConstantIntrinsics.h
@@ -23,7 +23,7 @@ namespace llvm {
 struct LowerConstantIntrinsicsPass :
     PassInfoMixin<LowerConstantIntrinsicsPass> {
 public:
-  explicit LowerConstantIntrinsicsPass() {}
+  explicit LowerConstantIntrinsicsPass() = default;
 
   /// Run the pass over the function.
   ///

diff --git a/llvm/include/llvm/Transforms/Scalar/WarnMissedTransforms.h b/llvm/include/llvm/Transforms/Scalar/WarnMissedTransforms.h
@@ -22,7 +22,7 @@ class Function;
 class WarnMissedTransformationsPass
     : public PassInfoMixin<WarnMissedTransformationsPass> {
 public:
-  explicit WarnMissedTransformationsPass() {}
+  explicit WarnMissedTransformationsPass() = default;
 
   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
 };

diff --git a/llvm/include/llvm/Transforms/Utils/CallGraphUpdater.h b/llvm/include/llvm/Transforms/Utils/CallGraphUpdater.h
@@ -53,7 +53,7 @@ class CallGraphUpdater {
   ///}
 
 public:
-  CallGraphUpdater() {}
+  CallGraphUpdater() = default;
   ~CallGraphUpdater() { finalize(); }
 
   /// Initializers for usage outside of a CGSCC pass, inside a CGSCC pass in

diff --git a/llvm/include/llvm/Transforms/Utils/SSAUpdaterBulk.h b/llvm/include/llvm/Transforms/Utils/SSAUpdaterBulk.h
@@ -42,7 +42,7 @@ class SSAUpdaterBulk {
     SmallVector<Use *, 4> Uses;
     StringRef Name;
     Type *Ty;
-    RewriteInfo(){};
+    RewriteInfo() = default;
     RewriteInfo(StringRef &N, Type *T) : Name(N), Ty(T){};
   };
   SmallVector<RewriteInfo, 4> Rewrites;
@@ -52,10 +52,10 @@ class SSAUpdaterBulk {
   Value *computeValueAt(BasicBlock *BB, RewriteInfo &R, DominatorTree *DT);
 
 public:
-  explicit SSAUpdaterBulk(){};
+  explicit SSAUpdaterBulk() = default;
   SSAUpdaterBulk(const SSAUpdaterBulk &) = delete;
   SSAUpdaterBulk &operator=(const SSAUpdaterBulk &) = delete;
-  ~SSAUpdaterBulk(){};
+  ~SSAUpdaterBulk() = default;
 
   /// Add a new variable to the SSA rewriter. This needs to be called before
   /// AddAvailableValue or AddUse calls. The return value is the variable ID,

diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -3486,7 +3486,7 @@ const SCEV *ScalarEvolution::getUDivExpr(const SCEV *LHS,
   return S;
 }
 
-const APInt gcd(const SCEVConstant *C1, const SCEVConstant *C2) {
+APInt gcd(const SCEVConstant *C1, const SCEVConstant *C2) {
   APInt A = C1->getAPInt().abs();
   APInt B = C2->getAPInt().abs();
   uint32_t ABW = A.getBitWidth();