fixed problem with terminate: when setting the stackpointer of an object, switch based on the existence of a shadow, don't assume it is already existent
fixed problem with terminate: when setting the stackpointer of an object, switch based on the existence of a shadow, don't assume it is already existent

HPI-SWA-Lab/RSqueak,HPI-SWA-Lab/RSqueak,HPI-SWA-Lab/RSqueak,HPI-SWA-Lab/RSqueak