Siying Dong 237a3da677 StopWatch not to get time if it is created for statistics and it is disabled
Summary: Currently, even if statistics is not enabled, StopWatch only for the stats still gets the time of the day, which is wasteful. This patch adds a new option to StopWatch to disable this get in this case.

Test Plan: make all check

Reviewers: dhruba, haobo, igor

CC: leveldb

Differential Revision: https://reviews.facebook.net/D14703

Conflicts:
	db/db_impl.cc
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