Summary:
This change fixes a couple of issues within the RCTUIManager:
* it calls the right method in the `super` branches (although they should neve be executed)
* it invert the call order between the `_registry` and the `uiManager` to avoid extra calls into the `viewForReactTag`.
## Changelog:
[Internal] - Use the right method in super and invert the order of where we search for views.
## Facebook:
See S397861 and T180527210 for more information.
Reviewed By: javache
Differential Revision: D54246220
fbshipit-source-id: 1c7503ad3e80cf50ecc016a984ca180a19b73cc0