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This patch completes the previous patch by adding a link back from the discovered pair, to the parent pair that generated this check. This link is needed by the ICE spec, to comply with section 8.1.1.1, "Regular nomination", where the check to be retriggered is the initial check that caused the discovery of the valid pair. When the valid pair is a peer-reflexive pair, the retriggered check must target the succeeded pair, and not the valid discovered pair. Differential Revision: https://phabricator.freedesktop.org/D879
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