[PATCH] R600: Implement getRsqrtEstimate

[Matt Arsenault]

Only do for f32 since I'm unclear on both what this is expecting
for the refinement steps in terms of accuracy, and what
f64 instruction actually provides.

http://reviews.llvm.org/D5636

Files:
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/AMDGPUISelLowering.h
  test/CodeGen/R600/fsqrt.ll
  test/CodeGen/R600/rsq.ll
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