[PATCH] [x86] Teach the target-specific combining how to aggressively foldhalf-shuffles, even looking through intervening instructions in a chain.

[Chandler Carruth]

Closed by commit rL211890 (authored by @chandlerc).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D4291

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