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Summary: Use a folly LRU implementation to cache results of ParagraphShadowNode::measure, which Yoga asks for repeatedly. Should have a substantial speed improvement on Android and iOS, or at least that's the dream. Reviewed By: mdvacca Differential Revision: D13795808 fbshipit-source-id: 5716af0fe0517a72716e48113c8125bb788735d7