CompactedDBImpl
Summary: Add a CompactedDBImpl that will enabled when calling OpenForReadOnly() and the DB only has one level (>0) of files. As a performan comparison, CuckooTable performs 2.1M/s with CompactedDBImpl vs. 1.78M/s with ReadOnlyDBImpl. Test Plan: db_bench Reviewers: yhchiang, igor, sdong Reviewed By: sdong Subscribers: leveldb Differential Revision: https://reviews.facebook.net/D23553
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