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0c991ec57a
stack, filter all handle nodes from the DAG combiner worklist. This will also handle cases where other handle nodes might be (erroneously) added to the worklist and then cause bugs and explosions when deleted. For example, when running the legalizer within the DAG combiner, there are times when other handle nodes are used and can end up here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213505 91177308-0d34-0410-b5e6-96231b3b80d8
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