mozilla/rust — pull request #7885 by graydon (2013-07-18 20:55:29+00:00)
Title: Workcache fixes 1

This just redoes various parts of workcache to support context-cloning (eventually quite crudely, via ARCs), the absence of which was blocking rustpkg from being able to use it. Better versions of this are possible (notably removing the ARCs on everything except the database) but it ought to work well enough for now.