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* [SimplifyCFG] Fold `llvm.guard(false)` to unreachableSanjoy Das2016-04-211-0/+86
Summary: `llvm.guard(false)` always bails out of the current compilation unit, so we can prune any control flow following it. Reviewers: hfinkel, pcc, reames Subscribers: majnemer, reames, mcrosier, llvm-commits Differential Revision: http://reviews.llvm.org/D19245 llvm-svn: 266955
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