[PATCH] [x86] Implement a faster vector population count based on the PSHUFB in-register LUT technique.

[Chandler Carruth]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10084

Files:
  llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
  llvm/trunk/lib/Target/X86/X86ISelLowering.h
  llvm/trunk/lib/Target/X86/X86InstrFragmentsSIMD.td
  llvm/trunk/lib/Target/X86/X86InstrSSE.td
  llvm/trunk/test/CodeGen/X86/vector-popcnt-128.ll
  llvm/trunk/test/CodeGen/X86/vector-popcnt-256.ll

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