Merging r200283:

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r200283 | michel.daenzer | 2014-01-27 19:01:16 -0800 (Mon, 27 Jan 2014) | 6 lines

R600/SI: Add pattern for truncating i32 to i1

Fixes half a dozen piglit tests with radeonsi.

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
llvm-svn: 204642