[clang] nonblocking/nonallocating attributes: 2nd pass caller/callee analysis (PR #99656)

[Doug Wyatt via cfe-commits]

dougsonos wrote:

@Sirraide , glad you're back and better, and thanks for the comments.

I think I agree and will remove the new diagnostics from "-Wall".

I also agree that documentation is wanting. I will look into expanding this, whether in the general attributes documentation or a new page (I'm speaking from a rusty memory of precedents, will go explore).

https://github.com/llvm/llvm-project/pull/99656