Limit stubs visibility
Limit stubs visibility

Summary: This should never be used outside of litho itself.

Reviewed By: IanChilds

Differential Revision: D6998175

fbshipit-source-id: cb0099925021bc5af4272719b3cf1182f91d60d5

facebook/litho,facebook/litho,facebook/litho,facebook/litho,facebook/litho,facebook/litho