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Summary: This avoids the very fragile code for null expressions. We could also use a denseset that tracks which things have null expressions instead, but that seems pretty fragile and premature optimization. This resolves a number of infinite loop cases, test reductions coming. Reviewers: davide Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D28193 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290816 91177308-0d34-0410-b5e6-96231b3b80d8
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