[SPARK-12060][CORE] Avoid memory copy in JavaSerializerInstance.serialize#10167

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zsxwing wants to merge 1 commit intoapache:masterfrom zsxwing:merge-SPARK-12060

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Commits on Dec 7, 2015

Revert "Revert "[SPARK-12060 ][CORE] Avoid memory copy in JavaSerializerInstance.serialize""
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