[PATCH] R600: Fix inconsistency in rsq instructions.

[Matt Arsenault]

R600 was using a clamped version of rsq, but SI was not. Add a
new rsq_clamped intrinsic and use them consistently.
    
It's unclear to me from the documentation what behavior
the R600 instructions have, so I assume they have the legacy behavior
described by the SI documents. For R600, use RECIPSQRT_IEEE
for both llvm.AMDGPU.rsq.legacy and llvm.AMDGPU.rsq. R600 also
has RECIPSQRT_FF, which I'm not sure how it fits in here.

http://reviews.llvm.org/D4204

Files:
  include/llvm/IR/IntrinsicsR600.td
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/AMDGPUISelLowering.h
  lib/Target/R600/AMDGPUInstrInfo.td
  lib/Target/R600/AMDGPUInstructions.td
  lib/Target/R600/AMDGPUIntrinsics.td
  lib/Target/R600/R600ISelLowering.cpp
  lib/Target/R600/R600Instructions.td
  lib/Target/R600/SIInstructions.td
  test/CodeGen/R600/llvm.AMDGPU.legacy.rsq.ll
  test/CodeGen/R600/llvm.AMDGPU.rsq.clamped.f64.ll
  test/CodeGen/R600/llvm.AMDGPU.rsq.clamped.ll
  test/CodeGen/R600/llvm.AMDGPU.rsq.ll
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