[PATCH] R600: Implement ftrunc, ffloor and fceil.

[Matt Arsenault]

CI has instructions for these, so this fixes them for older hardware.

http://reviews.llvm.org/D4063

Files:
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/AMDGPUISelLowering.h
  test/CodeGen/R600/fceil.ll
  test/CodeGen/R600/ffloor.ll
  test/CodeGen/R600/ftrunc.ll
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