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0d1c7a1bea
If AnalyzeBranch can't analyze a block and it is possible to fallthrough, then duplicating the block doesn't make sense, as only one block can be the layout predecessor for the un-analyzable fallthrough. Submitted wit a test case, but NOTE: the test case doesn't currently fail. However, the test case fails with D20505 and would have saved me some time debugging. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278288 91177308-0d34-0410-b5e6-96231b3b80d8