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Summary: A funclet EH pad may be exited by an unwind edge, which may be a cleanupret exiting its cleanuppad, an invoke exiting a funclet, or an unwind out of a nested funclet transitively exiting its parent. Funclet EH personalities require all such exceptional exits from a given funclet to have the same unwind destination, and EH preparation / state numbering / table generation implicitly depends on this. Formalize it as a rule of the IR in the LangRef and verifier. Reviewers: rnk, majnemer, andrew.w.kaylor Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D15962 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257273 91177308-0d34-0410-b5e6-96231b3b80d8