[clang] Thread Safety Analysis: Support attributes on function pointers (PR #191187)

[Marco Elver via cfe-commits]

melver wrote:

> @melver There are two commits associated with this pull request:
> 
> * Thread Safety Analysis: Support attributes on function pointers
> * fixup! Thread Safety Analysis: Support attributes on function pointers
> 
> Do you perhaps plan to combine both commits into a single commit?

It will once it'll be merged - LLVM Github repo is configured to only allow "Squash and merge", so at the latest then (see [guidance](https://llvm.org/docs/GitHub.html#rebasing-pull-requests-and-force-pushes)) - not the easiest for a "patch series" as that requires "stacked PRs", but that's not applicable here.

https://github.com/llvm/llvm-project/pull/191187