AMDGPU : Fix common dominator of two incoming blocks terminates with uniform branch issue.

Differential Revision: http://reviews.llvm.org/D31350

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300142 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed