Store range tombstones in memtable
Summary: - Store range tombstones in a separate MemTableRep instantiated with ColumnFamilyOptions::memtable_factory - MemTable::NewRangeTombstoneIterator() returns a MemTableIterator over the separate MemTableRep - Part of the read path is not implemented yet (i.e., MemTable::Get()) Test Plan: see unit tests Reviewers: wanning Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D62217
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