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We do not support splitting cleanuppad or catchswitches. This is problematic for passes which assume that a loop is in loop simplify form (the loop would have a dedicated exit block instead of sharing it). While it isn't great that we don't support this for cleanups, we still cannot make loop-simplify form an assertable precondition because indirectbr will also disable these sorts of CFG cleanups. This fixes PR28132. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272739 91177308-0d34-0410-b5e6-96231b3b80d8
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