dillon1000/react

Make createFiber use a constructor object rather than an object literal object (#9369)

* made createFiber create a constructed FiberNode object

* updated comment

* satisfying flow and prettier

* better comments :)

* fixes flow error

* updates comment

* converted function constructor to a ES2015 class

* Revert "converted function constructor to a ES2015 class"

This reverts commit c020982c5fe62446667f6f933c834366c3f009b3.

* fixed some merge conflict issues

* Flow....

* removed exact types to make flow pass

* opted for $FlowFixMe instead

* removed exact types to make flow pass

* opted for $FlowFixMe instead

* run prettier