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Summary: Instead of having a single point at the top of InitializeCore, let's just create a subspan for it. Initially I just wanted to use this point to track JS start time, but it'll be useful to see how long initializeCore takes, too. Reviewed By: alexeylang Differential Revision: D10521595 fbshipit-source-id: 3025c34ffab39b79efc966f0c0eb6f502c91c550