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Cut off crazy computation. This helps PR1622 slightly.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41522 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -8284,6 +8284,10 @@ static bool DeadPHICycle(PHINode *PN,
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if (!PotentiallyDeadPHIs.insert(PN))
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return true;
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// Don't scan crazily complex things.
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if (PotentiallyDeadPHIs.size() == 16)
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return false;
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if (PHINode *PU = dyn_cast<PHINode>(PN->use_back()))
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return DeadPHICycle(PU, PotentiallyDeadPHIs);
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