[clang] [clang][Sema] Add diagnostic note for reference of function-like macros requiring without parentheses (PR #123495)

[Aaron Ballman via cfe-commits]

================
@@ -10855,6 +10857,8 @@ def err_undeclared_use_suggest : Error<
   "use of undeclared %0; did you mean %1?">;
 def err_undeclared_var_use_suggest : Error<
   "use of undeclared identifier %0; did you mean %1?">;
+def err_undeclared_var_use_suggest_func_like_macro
+    : Error<"use of undeclared identifier %0; did you mean %0(...)?">;
----------------
AaronBallman wrote:

```suggestion
    : Error<"%0 is defined as an object-like macro; did you mean '%0(...)'?">;
```

https://github.com/llvm/llvm-project/pull/123495