[clang] nolock/noalloc attributes (PR #84983)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

> This is an early PR to solicit comments on the overall approach and a number of outstanding questions.

You should advertise this elsewhere (e.g. in RFC thread), or remove the draft status so that reviewers can see this as something they should provide feedback on.

https://github.com/llvm/llvm-project/pull/84983