[VectorCombine] support mismatching extract/insert indices for foldInsExtFNeg (#126408) insertelt DestVec, (fneg (extractelt SrcVec, Index)), Index -> shuffle DestVec, (shuffle (fneg SrcVec), poison, SrcMask), Mask In previous, the above transform was only possible if the Extract/Insert Index was the same; this patch makes the above transform possible even if the two indexes are different. Proof: https://alive2.llvm.org/ce/z/aDfdyG Fixes: https://github.com/llvm/llvm-project/issues/125675
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