[Rocksdb] measure table open io in a histogram
Summary: Table is setup for compaction using Table::SetupForCompaction. So read block calls can be differentiated b/w Gets/Compaction. Use this and measure times. Test Plan: db_bench --statistics=1 Reviewers: dhruba, haobo Reviewed By: haobo CC: leveldb, MarkCallaghan Differential Revision: https://reviews.facebook.net/D11217
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