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

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Sirraide wrote:

> It is only to tag functions. I guess the name would be `clspv_libclc_builtin` (https://github.com/llvm/llvm-project/blob/main/libclc/generic/include/clc/clcfunc.h#L11).

Alright, good to know, that should work.

> I've started to test with such a solution to make sure everything works on clspv side, but I need more time.

I’m currently busy anyway; I’ll probably only get to working on this next week or so, so no problem.

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