Bo Liu 204af1eccc add WriteBatch::WriteBatch(std::string&&)
Summary:
to save a string copy for some use cases.

The change is pretty straightforward, please feel free to let me know if you want to suggest any tests for it.
Closes https://github.com/facebook/rocksdb/pull/3349

Differential Revision: D6706828

Pulled By: yiwu-arbug

fbshipit-source-id: 873ce4442937bdc030b395c7f99228eda7f59eb7
2018-01-11 15:43:56 -08:00
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