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

[Andrea Di Biagio]

> This patch fixes the problem by checking if Mask[0] and Mask[2] contain value SM_SentinelZero.


I should have written:
"This patch fixes the problem by checking if Mask[0] and Mask[2] contain value SM_SentinelUndef".


http://reviews.llvm.org/D8119

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