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

[Erich Keane via cfe-commits]

erichkeane wrote:

> @erichkeane Since you’ve approved the pr, shall we merge it once CI is done or do you still want to wait for Shafik to review the release note?
> 
> (I don’t have anything else to comment on either)

I'm OK just committing.  Shafik did a run at the release note that wasn't better enough to warrant any changes here, and I think it is clear enough for now.  If someone has an improvement to make the release note better, patches welcome :) 

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