[PATCH] D18917: AMDGPU/SI: Add support for spilling VGPRs without having to scavenge registers

[Tom Stellard via llvm-commits]

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When we are spilling SGPRs to scratch memory, we usually don't have
free SGPRs to do the address calculation, so we need to re-use the
ScratchOffset register for the calculation.

http://reviews.llvm.org/D18917

Files:
  lib/Target/AMDGPU/SIRegisterInfo.cpp
  lib/Target/AMDGPU/SIRegisterInfo.h

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