diff --git a/llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h b/llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
index 118a177f88dfb..44eac6bb2ba33 100644
--- a/llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
+++ b/llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
@@ -228,7 +228,11 @@ class MachineIRBuilder {
 
   void validateSelectOp(const LLT ResTy, const LLT TstTy, const LLT Op0Ty,
                         const LLT Op1Ty);
-  void recordInsertion(MachineInstr *MI) const;
+
+  void recordInsertion(MachineInstr *InsertedInstr) const {
+    if (State.Observer)
+      State.Observer->createdInstr(*InsertedInstr);
+  }
 
 public:
   /// Some constructors for easy use.
@@ -292,10 +296,16 @@ class MachineIRBuilder {
   /// Set the insertion point before the specified position.
   /// \pre MBB must be in getMF().
   /// \pre II must be a valid iterator in MBB.
-  void setInsertPt(MachineBasicBlock &MBB, MachineBasicBlock::iterator II);
+  void setInsertPt(MachineBasicBlock &MBB, MachineBasicBlock::iterator II) {
+    assert(MBB.getParent() == &getMF() &&
+           "Basic block is in a different function");
+    State.MBB = &MBB;
+    State.II = II;
+  }
+
   /// @}
 
-  void setCSEInfo(GISelCSEInfo *Info);
+  void setCSEInfo(GISelCSEInfo *Info) { State.CSEInfo = Info; }
 
   /// \name Setters for the insertion point.
   /// @{
@@ -304,11 +314,20 @@ class MachineIRBuilder {
 
   /// Set the insertion point to the  end of \p MBB.
   /// \pre \p MBB must be contained by getMF().
-  void setMBB(MachineBasicBlock &MBB);
+  void setMBB(MachineBasicBlock &MBB) {
+    State.MBB = &MBB;
+    State.II = MBB.end();
+    assert(&getMF() == MBB.getParent() &&
+           "Basic block is in a different function");
+  }
 
   /// Set the insertion point to before MI.
   /// \pre MI must be in getMF().
-  void setInstr(MachineInstr &MI);
+  void setInstr(MachineInstr &MI) {
+    assert(MI.getParent() && "Instruction is not part of a basic block");
+    setMBB(*MI.getParent());
+    State.II = MI.getIterator();
+  }
   /// @}
 
   /// Set the insertion point to before MI, and set the debug loc to MI's loc.
@@ -318,8 +337,11 @@ class MachineIRBuilder {
     setDebugLoc(MI.getDebugLoc());
   }
 
-  void setChangeObserver(GISelChangeObserver &Observer);
-  void stopObservingChanges();
+  void setChangeObserver(GISelChangeObserver &Observer) {
+    State.Observer = &Observer;
+  }
+
+  void stopObservingChanges() { State.Observer = nullptr; }
   /// @}
 
   /// Set the debug location to \p DL for all the next build instructions.
@@ -335,7 +357,9 @@ class MachineIRBuilder {
   /// \pre setBasicBlock or setMI must have been called.
   ///
   /// \return a MachineInstrBuilder for the newly created instruction.
-  MachineInstrBuilder buildInstr(unsigned Opcode);
+  MachineInstrBuilder buildInstr(unsigned Opcode) {
+    return insertInstr(buildInstrNoInsert(Opcode));
+  }
 
   /// Build but don't insert <empty> = \p Opcode <empty>.
   ///
diff --git a/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp b/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
index 4236fdd820842..ea98233beb0ec 100644
--- a/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
@@ -33,48 +33,10 @@ void MachineIRBuilder::setMF(MachineFunction &MF) {
   State.Observer = nullptr;
 }
 
-void MachineIRBuilder::setMBB(MachineBasicBlock &MBB) {
-  State.MBB = &MBB;
-  State.II = MBB.end();
-  assert(&getMF() == MBB.getParent() &&
-         "Basic block is in a different function");
-}
-
-void MachineIRBuilder::setInstr(MachineInstr &MI) {
-  assert(MI.getParent() && "Instruction is not part of a basic block");
-  setMBB(*MI.getParent());
-  State.II = MI.getIterator();
-}
-
-void MachineIRBuilder::setCSEInfo(GISelCSEInfo *Info) { State.CSEInfo = Info; }
-
-void MachineIRBuilder::setInsertPt(MachineBasicBlock &MBB,
-                                   MachineBasicBlock::iterator II) {
-  assert(MBB.getParent() == &getMF() &&
-         "Basic block is in a different function");
-  State.MBB = &MBB;
-  State.II = II;
-}
-
-void MachineIRBuilder::recordInsertion(MachineInstr *InsertedInstr) const {
-  if (State.Observer)
-    State.Observer->createdInstr(*InsertedInstr);
-}
-
-void MachineIRBuilder::setChangeObserver(GISelChangeObserver &Observer) {
-  State.Observer = &Observer;
-}
-
-void MachineIRBuilder::stopObservingChanges() { State.Observer = nullptr; }
-
 //------------------------------------------------------------------------------
 // Build instruction variants.
 //------------------------------------------------------------------------------
 
-MachineInstrBuilder MachineIRBuilder::buildInstr(unsigned Opcode) {
-  return insertInstr(buildInstrNoInsert(Opcode));
-}
-
 MachineInstrBuilder MachineIRBuilder::buildInstrNoInsert(unsigned Opcode) {
   MachineInstrBuilder MIB = BuildMI(getMF(), getDL(), getTII().get(Opcode));
   return MIB;