[clang] [libclc] [llvm] [openmp] [Clang] `__attribute__((assume))` refactor (PR #84934)

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Sirraide wrote:

> Hi @Sirraide : I appreciate the patch! However, I'm not particularly likely to get a chance to take a look before I go to the WG21 meeting next week, so I'll likely need to review this in April when I get back. I just wanted to mention that so you don't think I'm ignoring you, just away.

Sure, no problem.

https://github.com/llvm/llvm-project/pull/84934