[SelectionDAG] combine vextract (v1iX extract_subvector(vNiX, Idx))
into vextract(vNiX,Idx) when creating vextract with getNode(). This case appeared in AVX512 after fixing pr33349 in r310552. Differential revision: https://reviews.llvm.org/D36571 llvm-svn: 310828
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