[PATCH] R600/SI: Use mad for fsub + fmul

[Matt Arsenault]

We can use a negate source modifier to match this for fsub.

http://reviews.llvm.org/D4942

Files:
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/AMDGPUISelLowering.h
  lib/Target/R600/AMDGPUInstrInfo.td
  lib/Target/R600/SIISelLowering.cpp
  lib/Target/R600/SIInstrInfo.td
  lib/Target/R600/SIInstructions.td
  test/CodeGen/R600/mad-sub.ll
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