[llvm] [InstCombine] Fold icmp on frexp exponent to fcmp on fabs(x) (PR #210711)

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FathimaHaris wrote:

@dtcxzyw @arsenm Thanks for the review. I have addressed all the feedback in the latest commit. Please let me know if there’s anything else that needs to be updated.

https://github.com/llvm/llvm-project/pull/210711