[PATCH] R600/SI: Add target node for rcp.

[Matt Arsenault]

This is necessary because it will be used for custom lowering f64 fdiv.

http://reviews.llvm.org/D4070

Files:
  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/AMDILIntrinsics.td
  lib/Target/R600/SIInstructions.td
  test/CodeGen/R600/llvm.AMDGPU.rcp.ll
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