Merging r258936:

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r258936 | thomas.stellard | 2016-01-27 07:53:52 -0800 (Wed, 27 Jan 2016) | 14 lines

AMDGPU/SI: Fix commuting of 32-bit VOPC instructions

Summary:
We didn't have entries in the commuting table for the 32-bit
instructions.  I don't think we hit this problem now, but we
will once uniform branching is enabled.  Tests will come in
a later commit.

Reviewers: arsenm

Subscribers: arsenm, llvm-commits

Differential Revision: http://reviews.llvm.org/D16600

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llvm-svn: 271589