[PATCH] R600: Make sign_extend_inreg legal.

[Matt Arsenault]

I don't know why I didn't just do this before

http://llvm-reviews.chandlerc.com/D3250

Files:
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/EvergreenInstructions.td
  lib/Target/R600/SIISelLowering.cpp
  lib/Target/R600/SIInstructions.td
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