Merging r181578:

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r181578 | tstellar | 2013-05-09 19:09:34 -0700 (Thu, 09 May 2013) | 10 lines

R600: Expand MUL for v4i32/v2i32

Fixes piglit test for OpenCL builtin mul24, and allows mad24 to run.

Patch by: Aaron Watry

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
Signed-off-by: Aaron Watry <awatry@gmail.com>

NOTE: This is a candidate for the 3.3 branch.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_33@181952 91177308-0d34-0410-b5e6-96231b3b80d8