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

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Sirraide wrote:

> Merging main into your branch tends to do that.

I’m not sure if this is the case, but my theory is that it’s specifically creating a new commit on merge that does that. After resolving conflicts, you have to run `git merge --continue` instead of committing manually. I always merge main instead of rebasing and I’ve never had any issues, but I’ve seen this happen to people several times.

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