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fix PR4915, a crash in -debug mode.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81177 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -548,7 +548,9 @@ public:
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o << "DFSNumbers invalid: " << SlowQueries << " slow queries.";
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o << "\n";
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PrintDomTree<NodeT>(getRootNode(), o, 1);
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// The postdom tree can have a null root if there are no returns.
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if (getRootNode())
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PrintDomTree<NodeT>(getRootNode(), o, 1);
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}
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protected:
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