Allows Get and MultiGet to read directly from SST files.
Summary: Add kSstFileTier to ReadTier, which allows Get and MultiGet to read only directly from SST files and skip mem-tables. kSstFileTier = 0x2 // data in SST files. // Note that this ReadTier currently only supports // Get and MultiGet and does not support iterators. Test Plan: add new test in db_test. Reviewers: anthony, IslamAbdelRahman, rven, kradhakrishnan, sdong Reviewed By: sdong Subscribers: igor, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D53511
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