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DAGCombiner: fix use-after-free when merging consecutive stores
Summary: Have MergeConsecutiveStores explicitly return information about the stores that were merged, so that we can safely determine whether the starting node has been freed. Reviewers: chandlerc, bogner, niravd Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D25601 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@285916 91177308-0d34-0410-b5e6-96231b3b80d8
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