Factor dep_node creation for sync and async (#2732)
Factor dep_node creation for sync and async (#2732)

Factor dep_node creation for sync and async
dra27/jbuilder,janestreet/jbuilder,dra27/jbuilder,janestreet/jbuilder,janestreet/jbuilder,janestreet/jbuilder,dra27/jbuilder,dra27/jbuilder,janestreet/jbuilder,dra27/jbuilder,dra27/jbuilder,janestreet/jbuilder