[PATCH] R600: Make sign_extend_inreg legal.

[Matt Arsenault]

  Use REG_SEQUENCE. Move to ISelDAGToDAG since using REG_SEQUENCE seems to be broken in tablegen

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D3250?vs=8279&id=8326#toc

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