[X86] combineVSelectToBLENDV - handle vselect(vXi1,A,B) -> blendv(sext(vXi1),A,B)
For pre-AVX512 targets, attempt to sign-extend a vXi1 condition mask to pass to a X86ISD::BLENDV node Fixes Issue #53760
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For pre-AVX512 targets, attempt to sign-extend a vXi1 condition mask to pass to a X86ISD::BLENDV node Fixes Issue #53760