Summary:
## Context
Right now, the ReactInstance construtor eagerly initializes native modules.
## Problem
When these modules initialize, they may load other modules. But, all those loads will fail, because the react instance is in the process of being constructed.
## Changes
Eagerly initialize modules after the react instance is created. That way, these native module requires work.
Changelog: [Internal]
Reviewed By: javache
Differential Revision: D58537536
fbshipit-source-id: d0e424df708ec35b014f5cecda11e8756e8f4346