[PATCH] R600/SI: Cleanup parsing of register names.

[Matt Arsenault]

Try to figure out the class and number of subregisters.

http://reviews.llvm.org/D3367

Files:
  lib/Target/R600/InstPrinter/AMDGPUInstPrinter.cpp
  lib/Target/R600/InstPrinter/AMDGPUInstPrinter.h
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