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

[Erich Keane via cfe-commits]

erichkeane wrote:

> Umm how could I resolve that? I tried various things but none working. 🥲

You'll have to spend some time in a debugger (note that `clang::DiagnosticIDs::EmitDiag` is where the diagnostic happens, so is a good place for a brekapoint).  But I see that in your creation of your expressions you use `SourceLocation{}` in a few places (which is the 'empty' source `SourceLocation` and likely what is being used for the diagnostic).

So you'll likely need to come up with a good location for at least one of those.

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