Bug 826650 - GC: Recalculation of GC fullness in EndSweepPhase broken r=billm

--HG--
extra : rebase_source : cac1534972ae56c5edeb2635dfd9c227209f69d9
Bug 826673 - GC: Only finish sweeping the current compartment group on reset r=billm

--HG--
extra : rebase_source : ccf87362e671c9bd90109816444f5b293b17d997