[MC] Clean up unused inline function and non-anchor defaulted destruc…

…tors; NFCI

Summary:
Take care of some missing clean-ups that belong with r249548 and some
other copy/paste that had happened. In particular, the destructors are
no longer vtable anchors after r249548; and `setSectionName` in
`MCSectionWasm` is private and unused since r313058 culled its only
caller. The destructors are now implicitly defined, and the unused
function is removed.

Reviewers: nemanjai, jasonliu, grosbach

Reviewed By: nemanjai

Subscribers: sbc100, aheejin, sunfish, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D57182

llvm-svn: 353597

llvm/include/llvm/MC/MCSectionCOFF.h

@@ -62,8 +62,6 @@ class MCSectionCOFF final : public MCSection {
   }
 
 public:
-  ~MCSectionCOFF();
-
   /// Decides whether a '.section' directive should be printed before the
   /// section name
   bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;

llvm/include/llvm/MC/MCSectionELF.h

@@ -63,8 +63,6 @@ class MCSectionELF final : public MCSection {
   void setSectionName(StringRef Name) { SectionName = Name; }
 
 public:
-  ~MCSectionELF();
-
   /// Decides whether a '.section' directive should be printed before the
   /// section name
   bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;

llvm/include/llvm/MC/MCSectionWasm.h

@@ -48,11 +48,7 @@ class MCSectionWasm final : public MCSection {
       : MCSection(SV_Wasm, K, Begin), SectionName(Section), UniqueID(UniqueID),
         Group(group) {}
 
-  void setSectionName(StringRef Name) { SectionName = Name; }
-
 public:
-  ~MCSectionWasm();
-
   /// Decides whether a '.section' directive should be printed before the
   /// section name
   bool shouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;

llvm/lib/MC/MCSectionCOFF.cpp

@@ -14,8 +14,6 @@
 
 using namespace llvm;
 
-MCSectionCOFF::~MCSectionCOFF() = default; // anchor.
-
 // ShouldOmitSectionDirective - Decides whether a '.section' directive
 // should be printed before the section name
 bool MCSectionCOFF::ShouldOmitSectionDirective(StringRef Name,

llvm/lib/MC/MCSectionELF.cpp

@@ -17,8 +17,6 @@
 
 using namespace llvm;
 
-MCSectionELF::~MCSectionELF() = default; // anchor.
-
 // Decides whether a '.section' directive
 // should be printed before the section name.
 bool MCSectionELF::ShouldOmitSectionDirective(StringRef Name,

llvm/lib/MC/MCSectionWasm.cpp

@@ -14,8 +14,6 @@
 
 using namespace llvm;
 
-MCSectionWasm::~MCSectionWasm() = default; // anchor.
-
 // Decides whether a '.section' directive
 // should be printed before the section name.
 bool MCSectionWasm::shouldOmitSectionDirective(StringRef Name,