[PATCH] R600/SI: Fix div_scale intrinsic

[Matt Arsenault]

The choice of 1st operand does matter, so add it back to the intrinsic. Implement selection for it, and add verifier check for operand restriction that the first operand must equal one of the other 2.

http://reviews.llvm.org/D4247

Files:
  include/llvm/IR/IntrinsicsR600.td
  lib/Target/R600/AMDGPUISelDAGToDAG.cpp
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/SIInstrInfo.cpp
  lib/Target/R600/SIInstrInfo.td
  lib/Target/R600/SIInstructions.td
  test/CodeGen/R600/llvm.AMDGPU.div_scale.ll
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