[PATCH] [X86][SSE] Improvements to byte shift shuffle matching

[Simon Pilgrim]

Closed by commit rL222796 (authored by @RKSimon).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6409

Files:
  llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
  llvm/trunk/test/CodeGen/X86/combine-or.ll
  llvm/trunk/test/CodeGen/X86/vector-shuffle-128-v2.ll
  llvm/trunk/test/CodeGen/X86/vector-shuffle-128-v4.ll
  llvm/trunk/test/CodeGen/X86/vector-shuffle-128-v8.ll
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