54b434110e
Summary: This is the second split of this pull request: https://github.com/facebook/rocksdb/pull/1891 which includes only the builder part. The testing will be included in the third split, where the reader is also included. Closes https://github.com/facebook/rocksdb/pull/1952 Differential Revision: D4660272 Pulled By: maysamyabandeh fbshipit-source-id: 36b3cf0