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Summary: ShadowNodeFamily is a new concept that allows us to implement an efficient way to solve the problem of finding a path to some ancestor node (practically reimplement ShadowNode::constructAncestorPath() in some efficient way). This diff is the first one in the series. It introduces a new class and moves some data into it. Reviewed By: JoshuaGross Differential Revision: D14416947 fbshipit-source-id: c93865a8929a2128498e34d3589487696aac6283