[llvm] [LoopIdiomRecognize] Enable clmul optimization for CRC loops (PR #203405)

[Ramkumar Ramachandra via llvm-commits]

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artagnon wrote:

Would be good if we could fix this somehow, maybe get largestLegalType, smallestLegalType, and check that clmul is legal on either? Not sure really, can @topperc suggest something perhaps?

https://github.com/llvm/llvm-project/pull/203405