Moves the register's current address to the next available.
        size_of_current specifies how many bytes/words to skip

def move_to_next_address(self, size_of_current):
        """Moves the register's current address to the next available.
        size_of_current specifies how many bytes/words to skip"""
        self._size_of_current_register_address = size_of_current
        self._current_address = self.next_address()
        self.mark_address(self._current_address, size_of_current)