methods.
* src/misc/freelist.cc (free_list::register_n,
free_list::releases_n): Rewrite using free_list::remove and
free_list::insert.
(free_list::remove, free_list::insert): New methods.
* src/tgba/bdddict.hh (bdd_dict::register_anonymous_variables):
New method.
(bdd_dict::annon_free_list): New subclass.
(bdd_dict::free_annonymous_list_of_type_of): New attribute.
* src/tgba/bdddict.cc (bdd_dict::register_all_variables_of,
bdd_dict::unregister_all_my_variables): Handle anonymous variables
too.
(bdd_dict::register_anonymous_variables,
bdd_dict::annon_free_list::annon_free_list,
bdd_dict::annon_free_list::extend): New methods.