[PATCH] D23347: [AVX512] Fix insertelement i1 lowering.

[Igor Breger via llvm-commits]

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[AVX512] Fix insertelement i1 lowering.
1 . Use shuffle to insert element i1 into vector. The previous implementation was incorrect ( dest_bit OR  src_bit , it doesn't clear the bit if src_bit=0 )
2.  Improve shuffle i1 vector, use CVT2MASK if supported instead TRUNCATE.

Repository:
  rL LLVM

https://reviews.llvm.org/D23347

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/avx512-ext.ll
  test/CodeGen/X86/avx512-insert-extract.ll
  test/CodeGen/X86/avx512-mask-op.ll
  test/CodeGen/X86/avx512-skx-insert-subvec.ll
  test/CodeGen/X86/vector-shuffle-v1.ll

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