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9dff21f0ab
My first attempt at this had an overly aggressive assert - chain nodes will only be removed, but we could hit the assert if a non-chain node was CSE'd (NodeToMatch, for instance). This reapplies r271706 by reverting r271713 and fixing an assert. Original message: Avoid relying on UB by looking into deleted nodes for a marker value. Instead, update the list of chain nodes as we go. llvm-svn: 271733
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