[clang] nonblocking/nonallocating attributes (was: nolock/noalloc) (PR #84983)

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Sirraide wrote:

> This change has some compile-time impact

I was not expecting that. Hmm, I wonder what’s causing this.

> Given that this is for a clang extension and not a conformance issue, I'm inclined to revert.

It might make sense to do that, yeah. Either way, we should investigate what’s going on here. @AaronBallman wdyt?

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