[PATCH] D23490: [AVX512] Generate KORTEST for CMP i1.

[Igor Breger via llvm-commits]

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[AVX512]  In some cases  CMP i1 , 0 ( implemented by KORTEST ) may be used instead of ZEXT + TEST sequence.

Repository:
  rL LLVM

https://reviews.llvm.org/D23490

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrAVX512.td
  test/CodeGen/X86/avx512-cmp.ll
  test/CodeGen/X86/avx512-i1test.ll
  test/CodeGen/X86/avx512-insert-extract.ll
  test/CodeGen/X86/masked_gather_scatter.ll
  test/CodeGen/X86/masked_memop.ll

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