[PATCH] R600/SI: Use v_cvt_f32_ubyte* instructions

[Matt Arsenault]

This eliminates extra extract instructions when loading an i8 vector to a float vector

http://reviews.llvm.org/D3915

Files:
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/AMDGPUISelLowering.h
  lib/Target/R600/AMDGPUInstrInfo.td
  lib/Target/R600/SIISelLowering.cpp
  lib/Target/R600/SIISelLowering.h
  lib/Target/R600/SIInstructions.td
  test/CodeGen/R600/bitcast.ll
  test/CodeGen/R600/cvt_f32_ubyte.ll
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