[PATCH] [X86][AVX] Fix wrong lowering of VPERM2X128 nodes.

[Andrea Di Biagio]

Hi Michael,

Here is a new version of the patch.
This time, we explicitly propagate permute index 0 (instead of SM_SentinelUndef) if we see that the resulting MaskLO/MaskHI would be undef.

Thanks,
Andrea


http://reviews.llvm.org/D8119

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/avx-vperm2x128.ll
  test/CodeGen/X86/vector-shuffle-512-v8.ll

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