Merging r195879:

Merging r195879:
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r195879 | tstellar | 2013-11-27 13:23:29 -0800 (Wed, 27 Nov 2013) | 6 lines

R600/SI: Use SGPR_32 register class for 32-bit SMRD outputs

Writing to the M0 register from an SMRD instruction hangs the GPU, so
we need to use the SGPR_32 register class, which does not include M0.

NOTE: This is a candidate for the 3.4 branch.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_34@195999 91177308-0d34-0410-b5e6-96231b3b80d8