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Summary: We should either require the DT info to be available, or check if it's available in every place we use DT (and we already miss such check in one place, which causes failures in some cases). As other loop passes preserve DT and it's usually available, it makes sense to just require it here. There is no regression test, because the bug only shows up if pass manager decides to clean DT info right before LoopUnswitch. If loop-unswitch is run separately, DT is available, so bug isn't exposed. Reviewers: chandlerc, hfinkel Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D13036 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248230 91177308-0d34-0410-b5e6-96231b3b80d8
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