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Revert "[VPlan] Remove unnecessary DomTreeUpdater flush (NFC)." (#144758)
This reverts commit 2e33734. Causes breakages internally, will post reproducer later.
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llvm/lib/Transforms/Vectorize/VPlan.cpp

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@@ -1015,6 +1015,8 @@ void VPlan::execute(VPTransformState *State) {
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for (VPBlockBase *Block : RPOT)
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Block->execute(State);
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State->CFG.DTU.flush();
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VPBasicBlock *Header = vputils::getFirstLoopHeader(*this, State->VPDT);
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if (!Header)
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return;

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