Move the X86 specific bits of the ELF writer to the Target/X86 directory.

Other targets will follow shortly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147060 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCELFObjectWriter.h

@@ -40,6 +40,10 @@ public:
 
   virtual ~MCELFObjectTargetWriter();
 
+  virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
+                                bool IsPCRel, bool IsRelocWithSymbol,
+                                int64_t Addend) const; // FIXME: add = 0
+
   /// @name Accessors
   /// @{
   uint8_t getOSABI() { return OSABI; }