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[InstCombine] Fold minmax intrinsic using KnownBits information (#76242)
This patch tries to fold minmax intrinsic by using `computeConstantRangeIncludingKnownBits`. Fixes regression in [_karatsuba_rec:cpython/Modules/_decimal/libmpdec/mpdecimal.c](https://github.com/python/cpython/blob/c31943af16f885c8cf5d5a690c25c366afdb2862/Modules/_decimal/libmpdec/mpdecimal.c#L5460-L5462), which was introduced by #71396. See also dtcxzyw/llvm-opt-benchmark#16 (comment). Alive2 for splat vectors with undef: https://alive2.llvm.org/ce/z/J8hKWd
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