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The old code computed dominators for every loop. This was terribly slow with no good reason. Just use the standard infrastructure for analysis passes. Differential Revision: http://reviews.llvm.org/D9586 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237176 91177308-0d34-0410-b5e6-96231b3b80d8
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