[PATCH] R600/SI: Add subtarget feature for denormal handling

[Matt Arsenault]

This allows toggling whether all denormals are flushed or not for double or single precision. Doesn't provide any way to use the available flush in only or flush out only modes, but I don't know what real use those are

http://reviews.llvm.org/D4232

Files:
  lib/Target/R600/AMDGPU.td
  lib/Target/R600/AMDGPUAsmPrinter.cpp
  lib/Target/R600/AMDGPUInstructions.td
  lib/Target/R600/AMDGPUSubtarget.cpp
  lib/Target/R600/AMDGPUSubtarget.h
  test/CodeGen/R600/default-fp-mode.ll
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