Multiplex pending reverse dep operations into IncrementalInMemoryNodeEntry.reverseDeps. Under `-XX:+UseCompactObjectHeaders` (8-byte object header), `IncrementalInMemoryNodeEntry` has 7 compressed-OOP fields (28 bytes) and 36 bytes total before alignment, padding each instance to 40 bytes (and `IncrementalSkybuildNodeEntry` to 48 bytes). Because `reverseDepsDataToConsolidate` is null on done nodes in steady state, multiplexing pending reverse dep operations into `reverseDeps` (using a marker `ArrayList` subclass when prior `reverseDeps` is empty, or a small record wrapper when incremental reverse deps already exist) removes the dedicated reference field and shrinks every `IncrementalInMemoryNodeEntry` and `IncrementalSkybuildNodeEntry` instance by 8 bytes. PiperOrigin-RevId: 1008943753 Change-Id: I94c6c48e2a1c2eddadb17082431428ba20f6dd89
{Fast, Correct} - Choose two
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