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Summary: `ShadowTree` class is already thread-safe, so we don't need to (we should not) guard concurent access to it. We should guard concurrent write-access to the collection of them though. Note that unordered_map is "thread-compatible" collection, so concurrent reading access is okay. Reviewed By: mdvacca Differential Revision: D13269745 fbshipit-source-id: 4779626018da0e42b81a835e538f6c1d1a8e25f7