Fix bad deleted memory write causing havoc, can't rely on avmcore being around in finalizers (r=stejohns,edwsmith)
Fix bad deleted memory write causing havoc, can't rely on avmcore being around in finalizers (r=stejohns,edwsmith)

pfgenyun/tamarin-redux,pnkfelix/tamarin-redux,pfgenyun/tamarin-redux,pfgenyun/tamarin-redux,pfgenyun/tamarin-redux,pnkfelix/tamarin-redux,pfgenyun/tamarin-redux,pfgenyun/tamarin-redux,pfgenyun/tamarin-redux,pfgenyun/tamarin-redux,pnkfelix/tamarin-redux,pnkfelix/tamarin-redux,pnkfelix/tamarin-redux,pnkfelix/tamarin-redux,pnkfelix/tamarin-redux