Dhruba Borthakur a58d48de79 Implement ReadWrite locks for leveldb
Summary:
Implement ReadWrite locks for leveldb. These will be helpful
to implement a read-modify-write operation (e.g. atomic increments).

Test Plan: does not modify any existing code

Reviewers: heyongqiang

Reviewed By: heyongqiang

CC: MarkCallaghan

Differential Revision: https://reviews.facebook.net/D5787
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