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

[Aaron Ballman via cfe-commits]

================
@@ -128,6 +128,7 @@ Improvements to Clang's diagnostics
   which are supposed to only exist once per program, but may get duplicated when
   built into a shared library.
 - Fixed a bug where Clang's Analysis did not correctly model the destructor behavior of ``union`` members (#GH119415).
+- Clang now provides a diagnostic note for ``function-like macros`` that are missing the required parentheses.
----------------
AaronBallman wrote:

```suggestion
- Clang now provides a diagnostic note for function-like macros that are
  missing the required parentheses (#GH123038).
```

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