MC: Add WinCOFFStreamer implementation and merge common code from MachO

into MCObjectStreamer.

Origonal Windows COFF implementation by Nathan Jedffords.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108678 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCObjectStreamer.h

@@ -16,6 +16,9 @@ namespace llvm {
 class MCAssembler;
 class MCCodeEmitter;
 class MCSectionData;
+class MCExpr;
+class MCFragment;
+class MCDataFragment;
 class TargetAsmBackend;
 class raw_ostream;
 
@@ -39,6 +42,14 @@ protected:
     return CurSectionData;
   }
 
+  MCFragment *getCurrentFragment() const;
+
+  /// Get a data fragment to write into, creating a new one if the current
+  /// fragment is not a data fragment.
+  MCDataFragment *getOrCreateDataFragment() const;
+
+  const MCExpr *AddValueSymbols(const MCExpr *Value);
+
 public:
   MCAssembler &getAssembler() { return *Assembler; }