[llvm] [LLVM][rtsan] Add nonblocking attribute for the realtime sanitizer (PR #100596)

[Chris Apple via llvm-commits]

cjappl wrote:

I have updated the review, splitting it into three:

1. The codeowners review https://github.com/llvm/llvm-project/pull/101231
2. This review introducing the attribute
3. The review introducing the transform, which directly depends on this review https://github.com/llvm/llvm-project/pull/101232

https://github.com/llvm/llvm-project/pull/100596