Implement the StartProc and EndProc Win64 EH methods on the base MCStreamer.

Based largely on Rafael Espindola's work on CFI. Other methods soon to follow.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131623 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCStreamer.h

@@ -18,6 +18,7 @@
 #include "llvm/Support/DataTypes.h"
 #include "llvm/MC/MCDirectives.h"
 #include "llvm/MC/MCDwarf.h"
+#include "llvm/MC/MCWin64EH.h"
 
 namespace llvm {
   class MCAsmInfo;
@@ -57,6 +58,10 @@ namespace llvm {
     MCDwarfFrameInfo *getCurrentFrameInfo();
     void EnsureValidFrame();
 
+    std::vector<MCWin64EHUnwindInfo> W64UnwindInfos;
+    MCWin64EHUnwindInfo *getCurrentW64UnwindInfo();
+    void EnsureValidW64UnwindInfo();
+
     const MCSymbol* LastNonPrivate;
 
     /// SectionStack - This is stack of current and previous section