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01523ae660
Summary: Diffing algorithm uses a small map for every layer of shadow tree; that's a lot of maps. Luckily, it does not need a complex feature-full map (which is not free to allocate and use), it needs a tiny map with a dozen values. Why do we need to pay for what we don't use? This diff introduces a trivial map optimized for constraints that we have here. (See more details in the code.) Reviewed By: mdvacca Differential Revision: D15200495 fbshipit-source-id: d859b68b9543253840b403e7430f945a0b76d87b