[clang] Diagnose misuse of the cleanup attribute (PR #80040)

[Erich Keane via cfe-commits]

erichkeane wrote:

> what would be the reason for windows build failing , is it a CI issue or specific to this PR & what can I do to resolve that. Thank you

That appears to be a problem with the CI itself.  I think we've fixed up a bunch of the CI, but it will require doing a 'merge' with main.  That said, I think you're OK to just squash/merge as-is.

https://github.com/llvm/llvm-project/pull/80040