[WebAssembly] Remove unused methods from MCWasmObjectTargetWriter

[sbc100]

Summary

These methods looks like they were originally came from MCELFObjectTargetWriter
but they are never called by the WasmObjectWriter.

Remove these methods meant the declaration of WasmRelocationEntry could
also move into the cpp file.

[sbc100]

• Merge remote-tracking branch 'origin/master' into remove_used_methods
• move relocation entry decl

[sbc100]

revert move

[sbc100]

• move relocation entry decl

include/llvm/MC/MCWasmObjectWriter.h

 
 class MCWasmObjectTargetWriter {
   const unsigned Is64Bit : 1;
 
 protected:
   explicit MCWasmObjectTargetWriter(bool Is64Bit_);
 
 public:
-  virtual ~MCWasmObjectTargetWriter() {}
+  virtual ~MCWasmObjectTargetWriter();
 
   virtual unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
                                 const MCFixup &Fixup, bool IsPCRel) const = 0;
 
-  virtual bool needsRelocateWithSymbol(const MCSymbol &Sym,
-                                       unsigned Type) const;
-
-  virtual void sortRelocs(const MCAssembler &Asm,
-                          std::vector<WasmRelocationEntry> &Relocs);
-
   /// \name Accessors
   /// @{
   bool is64Bit() const { return Is64Bit; }
   /// @}
 };
 
 /// \brief Construct a new Wasm writer instance.
 ///
 /// \param MOTW - The target specific Wasm writer subclass.
 /// \param OS - The stream to write to.
 /// \returns The constructed object writer.
 MCObjectWriter *createWasmObjectWriter(MCWasmObjectTargetWriter *MOTW,
                                        raw_pwrite_stream &OS);
 } // End llvm namespace
 
 #endif

lib/MC/MCWasmObjectTargetWriter.cpp

 #include "llvm/MC/MCValue.h"
 #include "llvm/MC/MCWasmObjectWriter.h"
 
 using namespace llvm;
 
 MCWasmObjectTargetWriter::MCWasmObjectTargetWriter(bool Is64Bit_)
     : Is64Bit(Is64Bit_) {}
 
-bool MCWasmObjectTargetWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
-                                                       unsigned Type) const {
-  return false;
-}
-
-void MCWasmObjectTargetWriter::sortRelocs(
-    const MCAssembler &Asm, std::vector<WasmRelocationEntry> &Relocs) {
-}
+// Pin the vtable to this object file
+MCWasmObjectTargetWriter::~MCWasmObjectTargetWriter() = default;