Add methods to parse the SEH directives to the COFFAsmParser. Implement some
of them, particularly the ones that don't take arguments. Also implement
.seh_proc and .seh_handler.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131866 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCStreamer.cpp b/lib/MC/MCStreamer.cpp
index f268f9e..1402033 100644
--- a/lib/MC/MCStreamer.cpp
+++ b/lib/MC/MCStreamer.cpp
@@ -316,7 +316,7 @@
     report_fatal_error("No open Win64 EH frame function!");
 }
 
-void MCStreamer::EmitWin64EHStartProc(MCSymbol *Symbol) {
+void MCStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
   if (CurFrame && !CurFrame->End)
     report_fatal_error("Starting a function before ending the previous one!");