[X86] Fix 48/96 byte memcmp code gen
Detect scalar ISD::ZERO_EXTEND generated by memcmp lowering and convert it to ISD::INSERT_SUBVECTOR. https://reviews.llvm.org/D69464
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Detect scalar ISD::ZERO_EXTEND generated by memcmp lowering and convert it to ISD::INSERT_SUBVECTOR. https://reviews.llvm.org/D69464