Islam AbdelRahman 99ffb3d533 Fix perf_context::merge_operator_time_nanos calculation
Summary: We were not measuring the time spent in merge_operator when called from Version::Get()

Test Plan: added a unittest

Reviewers: sdong, yhchiang

Reviewed By: yhchiang

Subscribers: andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D55905
2016-03-25 18:29:43 -07:00
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