save/[1,2] are gone. ref-sls explains why these
have been removed. In most cases save_program/2 can be used in
their place, with a little rearrangement of your code.
Foreign code is no longer included in saved-states. When a
saved-state is used it needs to be able to find the relevant object files
and cause them to be linked in. Since this linking can be slow, it
will often be preferable to use qld to link your saved-state with
its object files into an executable file. See sap-srs-bas-cld for
how to do this.