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* [MemorySSA] Additional handling of unreachable blocks.Alina Sbirlea2019-10-101-0/+40
Summary: Whenever we get the previous definition, the assumption is that the recursion starts ina reachable block. If the recursion starts in an unreachable block, we may recurse indefinitely. Handle this case by returning LoE if the block is unreachable. Resolves PR43426. Reviewers: george.burgess.iv Subscribers: Prazek, sanjoy.google, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D68809 llvm-svn: 374447
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