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Backport "[SimplifyCFG] Correctly test for unconditional branches in GetCaseResults" #54
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…ults GetCaseResults assumed that a terminator with one successor was an unconditional branch. This is not necessarily the case, it could be a cleanupret. Strengthen the check by querying whether or not the terminator is exceptional. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283517 91177308-0d34-0410-b5e6-96231b3b80d8
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Fixes rust-lang/rust#36924