Move EmitInstruction to MCObjectStreamer so that ELF and MachO can share it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117925 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/WinCOFFStreamer.cpp b/lib/MC/WinCOFFStreamer.cpp
index b270648..5a2a7f9 100644
--- a/lib/MC/WinCOFFStreamer.cpp
+++ b/lib/MC/WinCOFFStreamer.cpp
@@ -81,6 +81,13 @@
   virtual void Finish();
 
 private:
+  virtual void EmitInstToFragment(const MCInst &Inst) {
+    llvm_unreachable("Not used by WinCOFF.");
+  }
+  virtual void EmitInstToData(const MCInst &Inst) {
+    llvm_unreachable("Not used by WinCOFF.");
+  }
+
   void SetSection(StringRef Section,
                   unsigned Characteristics,
                   SectionKind Kind) {