Fix RecordIn and RecordDrop stats
Summary: 1. fix possible overflow of the two stats by using uint64_t 2. use a similar source of data to calculate RecordDrop. Previous one is not correct. Test Plan: See outputs of db_bench settings, and the results look reasonable Reviewers: MarkCallaghan, ljin, igor Reviewed By: igor Subscribers: rven, leveldb, yhchiang, dhruba Differential Revision: https://reviews.facebook.net/D28155
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