Merging r262732:
------------------------------------------------------------------------
r262732 | thomas.stellard | 2016-03-04 10:31:18 -0800 (Fri, 04 Mar 2016) | 12 lines
AMDGPU/SI: Add support for spiling SGPRs to scratch buffer
Summary:
This is necessary for when we run out of VGPRs and can no
longer use v_{read,write}_lane for spilling SGPRs.
Reviewers: arsenm
Subscribers: arsenm, llvm-commits
Differential Revision: http://reviews.llvm.org/D17592
------------------------------------------------------------------------
llvm-svn: 271722
