[PATCH] R600/SI: Custom lower fround

[Matt Arsenault]

This fixes it for SI. It also removes the pattern
used previously for Evergreen for f32. I'm not sure
if the the new R600 output is better or not, but it uses
1 fewer instructions if BFI is available.

http://reviews.llvm.org/D7079

Files:
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/AMDGPUISelLowering.h
  lib/Target/R600/EvergreenInstructions.td
  lib/Target/R600/R600Instructions.td
  test/CodeGen/R600/llvm.round.f64.ll
  test/CodeGen/R600/llvm.round.ll

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