[PATCH] Use rcpss/rcpps (X86) to speed up reciprocal calcs (PR21385)

[Sanjay Patel]

Closed by commit rL221706 (authored by @spatel).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6175

Files:
  llvm/trunk/lib/Target/X86/X86.td
  llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
  llvm/trunk/lib/Target/X86/X86ISelLowering.h
  llvm/trunk/lib/Target/X86/X86Subtarget.h
  llvm/trunk/test/CodeGen/X86/recip-fastmath.ll
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