Allow users to profile a query and see bottleneck of the query
Summary: Provide a framework to profile a query in detail to figure out latency bottleneck. Currently, in Get(), Put() and iterators, 2-3 simple timing is used. We can easily add more profile counters to the framework later. Test Plan: Enable this profiling in seveal existing tests. Reviewers: haobo, dhruba, kailiu, emayanke, vamsi, igor CC: leveldb Differential Revision: https://reviews.facebook.net/D14001 Conflicts: table/merger.cc
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