Use isInvalidDecl() instead of isStatic() as suggested by dblaikie.

I couldn't think of a way to make an operator() invalid without returning
earlier from this function other than making it static, so no new test.

llvm-svn: 167609

clang/lib/Sema/SemaOverload.cpp

@@ -10999,7 +10999,7 @@ Sema::BuildCallToObjectOfClassType(Scope *S, Expr *Obj,
   CXXMethodDecl *Method = cast<CXXMethodDecl>(Best->Function);
 
   // An error diagnostic has already been printed when parsing the declaration.
-  if (Method->isStatic())
+  if (Method->isInvalidDecl())
     return ExprError();
 
   const FunctionProtoType *Proto =