[clang] [clang][Sema] Handle alloc_align on all HasFunctionProto declarations (PR #210871)

[Erich Keane via cfe-commits]

erichkeane wrote:

> @erichkeane thank you a lot for the approval. I think some github workflows for the CI also need approval from a maintainer?

Done, and enabled auto-merge if they succeed.

https://github.com/llvm/llvm-project/pull/210871