MC-COFF: Add COFFAsmParser. Completes PR8343.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116150 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index 9554985..23ae5f2 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -269,6 +269,7 @@
 
 extern MCAsmParserExtension *createDarwinAsmParser();
 extern MCAsmParserExtension *createELFAsmParser();
+extern MCAsmParserExtension *createCOFFAsmParser();
 
 }
 
@@ -288,7 +289,10 @@
   //
   // FIXME: This is a hack, we need to (majorly) cleanup how these objects are
   // created.
-  if (_MAI.hasSubsectionsViaSymbols()) {
+  if (_MAI.hasMicrosoftFastStdCallMangling()) {
+    PlatformParser = createCOFFAsmParser();
+    PlatformParser->Initialize(*this);
+  } else if (_MAI.hasSubsectionsViaSymbols()) {
     PlatformParser = createDarwinAsmParser();
     PlatformParser->Initialize(*this);
   } else {