[RocksDB] Simplify StopWatch implementation
Summary: Make stop watch a simple implementation, instead of subclass of a virtual class Allocate stop watches off the stack instead of heap. Code is more terse now. Test Plan: make all check, db_bench with --statistics=1 Reviewers: haobo, dhruba Reviewed By: haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D10809
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