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4b2ad41bab
This change relaxes the checks for hasOnlyUniformBranches such that our
region is uniform if:
1. All conditional branches that are direct children are uniform.
2. And either:
a. All sub-regions are uniform.
b. There is one or less conditional branches among the direct
children.
Differential Revision: https://reviews.llvm.org/D62198
llvm-svn: 361610