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/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index c86d171..3baff5c 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -3907,7 +3907,7 @@
   MachineFunction &MF = DAG.getMachineFunction();
   const Function* Fn = MF.getFunction();
   if (Fn->hasExternalLinkage() &&
-      Subtarget->TargetType == X86Subtarget::isCygwin &&
+      Subtarget->isTargetCygwin() &&
       Fn->getName() == "main")
     MF.getInfo<X86FunctionInfo>()->setForceFramePointer(true);