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

[Doug Wyatt via cfe-commits]

dougsonos wrote:

> I do agree, it seems reasonable for it to be in `-Wall` or similar! That is absolutely what I'd expect as a user :)

I guess my thinking was colored a bit by the way many of our codebases use `-Wall`.

I did come around to thinking that without `-Wall`, it's cleaner for the diagnostics to be disabled by default. Pushed a change.

Thanks, Chris.

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