(>) ignore native blocks if --c_calls is set
(*) GENERAL REFACTORING
(*) not working
(*) backup
(*) refactoring complete
(*) REFACTORING:
    (>) current stack item moved to top of the stack
    (>) stack holds the full "go" state
    (>) "emit this.ok" one by one (no overflow)
    (>) vector constructor uses loop
    (-) ceu_sys_clear inlined