Bug 1204866 - IonMonkey: Crash when failing to apand to parse finished list, r=bhackett

js/src/vm/HelperThreads.cpp

@@ -1277,7 +1277,8 @@ HelperThread::handleParseWorkload()
 
     // FinishOffThreadScript will need to be called on the script to
     // migrate it into the correct compartment.
-    HelperThreadState().parseFinishedList().append(parseTask);
+    if (!HelperThreadState().parseFinishedList().append(parseTask))
+        CrashAtUnhandlableOOM("handleParseWorkload");
 
     parseTask = nullptr;