Bug 808067 - Change the compartments we iterate over when ending GC (r=jonco)

js/src/jsgc.cpp

@@ -4154,12 +4154,12 @@ AutoGCSlice::AutoGCSlice(JSRuntime *rt)
 
 AutoGCSlice::~AutoGCSlice()
 {
-    for (GCCompartmentsIter c(runtime); !c.done(); c.next()) {
+    /* We can't use GCCompartmentsIter if this is the end of the last slice. */
+    for (CompartmentsIter c(runtime); !c.done(); c.next()) {
         if (c->isGCMarking()) {
             c->setNeedsBarrier(true, JSCompartment::UpdateIon);
             c->arenas.prepareForIncrementalGC(runtime);
         } else {
-            JS_ASSERT(c->isGCSweeping());
             c->setNeedsBarrier(false, JSCompartment::UpdateIon);
         }
     }