Relax memory order for faster tickers
Summary: The default behavior for atomic operations is sequentially consistent ordering which is not needed for simple counters (see: http://en.cppreference.com/w/cpp/atomic/memory_order). Change the memory order to std::memory_order_relaxed for better performance. Test Plan: make clean all check Reviewers: rven, anthony, yhchiang, aekmekji, sdong, MarkCallaghan, igor Reviewed By: igor Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D46953
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