Matt Arsenault 6408c9135c AMDGPU: Allow some control flow intrinsics to be CSEd ...

These clean up some unnecessary or instructions in
cases with complex loops.

In the original testcase I noticed this, the same
or with exec was repeated 5 or 6 times in a row. With
this only one is emitted or sometimes a copy.

llvm-svn: 281786

2016-09-16 22:11:18 +00:00

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