[PATCH] [X86][SSE] Generalised unpackl/unpckh shuffle matching

[Simon Pilgrim]

Thanks Quentin, fixed bad shuffle mask and tightened tests. Added extra unpckh test.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7564

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vector-shuffle-128-v4.ll
  test/CodeGen/X86/vector-shuffle-256-v4.ll
  test/CodeGen/X86/vector-shuffle-256-v8.ll

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