Enable Flow types first and abstract locations (#2877)
Enable Flow types first and abstract locations (#2877)

Summary:
These are performance optimizations based based on strict exports.
This ensures we're compatible with these stricter settings internally.
Pull Request resolved: https://github.com/facebook/relay/pull/2877

Reviewed By: alunyov

Differential Revision: D17713843

Pulled By: kassens

fbshipit-source-id: ce6abdcc7119f6e164aebc2338f41b51dadb1f51

voideanvalue/relay,wincent/relay,wincent/relay,facebook/relay,facebook/relay,voideanvalue/relay,atxwebs/relay,kassens/relay,wincent/relay,xuorig/relay,xuorig/relay,wincent/relay,wincent/relay,josephsavona/relay,kassens/relay,facebook/relay,kassens/relay,xuorig/relay,facebook/relay,voideanvalue/relay,yungsters/relay,voideanvalue/relay,iamchenxin/relay,atxwebs/relay,cpojer/relay,xuorig/relay,yungsters/relay,xuorig/relay,atxwebs/relay,yungsters/relay,cpojer/relay,atxwebs/relay,cpojer/relay,wincent/relay,kassens/relay,xuorig/relay,cpojer/relay,facebook/relay,facebook/relay,kassens/relay,iamchenxin/relay,kassens/relay,iamchenxin/relay,josephsavona/relay,voideanvalue/relay,voideanvalue/relay,iamchenxin/relay,josephsavona/relay