* eval.h (scm_t_trampoline_1, scm_t_trampoline_2): New types.

* eval.h (scm_t_trampoline_1, scm_t_trampoline_2): New types.

* eval.c, eval.h (scm_trampoline_1, scm_trampoline_2): New functions.

* eval.c (call_subr2_2, call_lsubr_2, call_closure_2): New functions;
(map, for-each): Handle also application on two args as a special
case; Use trampolines.

* sort.c (scm_cmp_function): Choose subr2less for scm_tc7_subr_2o;
(subr2oless): Removed.
(scm_restricted_vector_sort_x): Use scm_return_first to keep the
vector GC protected.

* eval.c (check_map_args): Use scm_out_of_range_pos instead of
scm_out_of_range.