[PATCH] [x86] eliminate unnecessary shuffling/moves with unary scalar math ops (PR21507)

[Sanjay Patel]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9504

Files:
  llvm/trunk/lib/Target/X86/X86InstrInfo.cpp
  llvm/trunk/lib/Target/X86/X86InstrSSE.td
  llvm/trunk/test/CodeGen/X86/sse-scalar-fp-arith-unary.ll

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