[clang] [llvm] [Vectorize][OpenMP] Support header-provided declare simd math variants (PR #189523)

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wpcwzy wrote:

Hi Alexey,

Thank you for your review. I will address the comments above and split this into two separate PRs.

I will continue the discussion there and close this PR once the split patches are up.

https://github.com/llvm/llvm-project/pull/189523