[libclc] [libclc] Produce subnormal results for exp/exp2 on FP32 (PR #212696)

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Lurie97 wrote:

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Thanks — I confirm I have read the LLVM contribution policies, including the
     LLVM AI Tool Use Policy.

     AI tool disclosure: I used an AI assistant to help draft the code changes and
     the PR description for this patch. All changes were reviewed, tested by me
     against the OpenCL CTS math_brute_force suite (erfc/exp/exp2), and I take
     responsibility for their correctness.



https://github.com/llvm/llvm-project/pull/212696