[PATCH] D145221: [X86] Prefer `vpternlog` instead of `blendv` for `vselect` on masks.

[Noah Goldstein via Phabricator via llvm-commits]

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This rarely comes up because most `vselect` are lowered with actually
avx512 mask instructions, but is an improvement in the rare cases.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145221

Files:
  llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
  llvm/test/CodeGen/X86/abds-vector-128.ll
  llvm/test/CodeGen/X86/abds-vector-256.ll
  llvm/test/CodeGen/X86/var-permute-256.ll

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