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THRIFT-752. java: Use a faster Stack implementation in TCompactProtocol
This patch adds ShortStack, an internal implementation of Stack that works directly on primitive short objects, and makes TCompactProtocol use this. A brief performance test shows that this makes serialization about 8% faster and deserialization about 15% faster, though the actual gain you see will be dependent on the nature of your structs - the more levels, the more gain.
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