Add USE_REACT_CACHE feature flag
Add USE_REACT_CACHE feature flag

Reviewed By: alunyov

Differential Revision: D32189028

fbshipit-source-id: 88ced79ebf6e923fe36f7b182dffbd2cf8b49368

kassens/relay,voideanvalue/relay,voideanvalue/relay,josephsavona/relay,voideanvalue/relay,facebook/relay,facebook/relay,xuorig/relay,xuorig/relay,josephsavona/relay,kassens/relay,wincent/relay,kassens/relay,facebook/relay,wincent/relay,wincent/relay,facebook/relay,kassens/relay,xuorig/relay,xuorig/relay,kassens/relay,xuorig/relay,facebook/relay,facebook/relay,wincent/relay,wincent/relay,josephsavona/relay,wincent/relay,voideanvalue/relay,kassens/relay,voideanvalue/relay,voideanvalue/relay,xuorig/relay