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

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Sirraide wrote:

> Added @AnastasiaStulova for help with the OpenCL questions. I would love to avoid adding `omp_assume` if possible.

Thanks, I didn’t know who to ping about that, and yeah, same.

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