[PATCH] [X86][SSE] Improve legal SHUFP and PSHUFD shuffle matching

[Simon Pilgrim]

Closed by commit rL222087 (authored by @RKSimon).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6287

Files:
  llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
  llvm/trunk/test/CodeGen/X86/vector-shuffle-256-v4.ll
  llvm/trunk/test/CodeGen/X86/vector-shuffle-combining.ll
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