Matt Arsenault b8f8dbc227 AMDGPU: Unify divergent function exits. ...

StructurizeCFG can't handle cases with multiple
returns creating regions with multiple exits.
Create a copy of UnifyFunctionExitNodes that only
unifies exit nodes that skips exit nodes
with uniform branch sources.

llvm-svn: 298729

2017-03-24 19:52:05 +00:00

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