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3b7b209bf8
updateTerminator code didn't correctly handle EH terminators in one very specific case. AnalyzeBranch would find no terminator instruction, and so the fallback in updateTerminator is to assume fallthrough. This is correct, but the destination of the fallthrough was assumed to be the first successor. This is *almost always* true, but in certain cases the loop transformations will cause the landing pad to be the first successor! Instead of this brittle logic, actually look through the successors for a non-landing-pad accessor, and to assert if more than one is found. This will hopefully fix some (if not all) of the self host miscompiles with block placement. Thanks to Benjamin Kramer for reporting, Nick Lewycky for an initial stab at a reduction, and Duncan for endless advice on EH (which I know nothing about) as well as reviewing the actual fix. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145062 91177308-0d34-0410-b5e6-96231b3b80d8
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