Summary:
sDidInit can be accessed from different threads, this diff refactors the definition of this variable to be volatile and also to be assigned at the end of the staticInit() method.
Changelog:
Ensure proper initialization of FabricSoLoder
Reviewed By: ejanzer
Differential Revision: D18010919
fbshipit-source-id: 3ec7b19fdc15056b90fc01281b8c3888e93a7dd3