Added some eye-candy for Subtarget type checking
Added X86 StdCall & FastCall calling conventions. Codegen will follow.

llvm-svn: 30446
diff --git a/llvm/lib/VMCore/Verifier.cpp b/llvm/lib/VMCore/Verifier.cpp
index cbef68b..57c09bb 100644
--- a/llvm/lib/VMCore/Verifier.cpp
+++ b/llvm/lib/VMCore/Verifier.cpp
@@ -332,6 +332,7 @@
     break;
   case CallingConv::Fast:
   case CallingConv::Cold:
+  case CallingConv::X86_FastCall:
     Assert1(!F.isVarArg(),
             "Varargs functions must have C calling conventions!", &F);
     break;