[PATCH] [X86][AVX2] Added support for 256-bit zero extension shuffle matching

[Simon Pilgrim]

Hi chandlerc, andreadb, spatel,

Enabled shuffle matching for the AVX2 zero extension (128bit -> 256bit) vpmovzx* instructions.

This is a follow-up to D7228 which adds shuffle decodes / assembly comments for the (v)pmovzx* comments - if that ticket gets approved I can update this patch's tests to include the comments.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7251

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vector-shuffle-256-v16.ll
  test/CodeGen/X86/vector-shuffle-256-v32.ll
  test/CodeGen/X86/vector-shuffle-256-v8.ll

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