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Summary: Funclet EH personalities require a tree-like nesting among funclets (enforced by the ParentPad linkage in the IR), and also require that unwind edges conform to certain rules with respect to the tree: - An unwind edge may exit 0 or more ancestor pads - An unwind edge must enter exactly one EH pad, which must be distinct from any exited pads - A cleanupret's edge must exit its cleanuppad Describe these rules in the LangRef, and enforce them in the verifier. Reviewers: rnk, majnemer, andrew.w.kaylor Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D15961 llvm-svn: 257272