[X86] computeKnownBitsForTargetNode - add basic X86ISD::BZHI handling (#177347) Currently limited to constant masks, if the mask (truncated to i8) if less than the bitwidth then it will zero the upper bits. So far it mainly just handles BZHI(X,0) -> 0 and BZHI(C1,C2) constant folding. All the BMI node combines seem to just call SimplifyDemandedBits - so I've merged them into a single combineBMI.
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