Emily Janzer d279b7c74d Add point at beginning of InitializeCore
Summary: Also add an optional timestamp param to PerformanceLogger.markPoint() so you can backdate a point

Reviewed By: alexeylang

Differential Revision: D10149337

fbshipit-source-id: 6cc5f95b34b3293589e7cb41b99cee17bf128163
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