Summary:
Release notes: Adds`createRef` and `forwardRef` to the React compiler
This PR adds both features from React 16.3, including full inlining of forwardRef functions.
Closes https://github.com/facebook/prepack/pull/1731
Differential Revision: D7599780
Pulled By: trueadm
fbshipit-source-id: 50458546c7a4374baea7fa80feb21262dd5692af