Standardize the parsing of function type attributes in a way that

follows (as conservatively as possible) gcc's current behavior:  attributes
written on return types that don't apply there are applied to the function
instead, etc.  Only parse CC attributes as type attributes, not as decl attributes;
don't accepet noreturn as a decl attribute on ValueDecls, either (it still
needs to apply to other decls, like blocks).  Consistently consume CC/noreturn
information throughout codegen;  enforce this by removing their default values
in CodeGenTypes::getFunctionInfo().

llvm-svn: 95436

clang/lib/CodeGen/CodeGenFunction.cpp

@@ -196,7 +196,9 @@ void CodeGenFunction::StartFunction(GlobalDecl GD, QualType RetTy,
   }
 
   // FIXME: Leaked.
-  CurFnInfo = &CGM.getTypes().getFunctionInfo(FnRetTy, Args);
+  // CC info is ignored, hopefully?
+  CurFnInfo = &CGM.getTypes().getFunctionInfo(FnRetTy, Args,
+                                              CC_Default, false);
 
   if (RetTy->isVoidType()) {
     // Void type; nothing to return.