[PATCH] R600/SI: Add getInstrInfo helper

[Matt Arsenault]

Having static_cast<const SIInstrInfo *>(getTargetMachine().getSubtargetImpl()->getInstrInfo()) littered everywhere is horrible, so add a wrapper for it.

http://reviews.llvm.org/D4802

Files:
  lib/Target/R600/SIISelLowering.cpp
  lib/Target/R600/SIISelLowering.h
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