[PATCH] R600/SI: Allow using f32 rcp / rsq when denormals not handled.

[Matt Arsenault]

These are precise enough to use for OpenCL unless denormals are handled.

http://reviews.llvm.org/D4526

Files:
  lib/Target/R600/SIISelLowering.cpp
  lib/Target/R600/SIISelLowering.h
  test/CodeGen/R600/llvm.AMDGPU.rcp.ll
  test/CodeGen/R600/rsq.ll
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