Perform a fast memory loading of some data.

        :param int addr: Address to read from.
        :param int length: Size of the string to load.
        :return:         A string or None if the address does not exist.
        :rtype:          bytes or None

def _fast_memory_load_bytes(self, addr, length):
        """
        Perform a fast memory loading of some data.

        :param int addr: Address to read from.
        :param int length: Size of the string to load.
        :return:         A string or None if the address does not exist.
        :rtype:          bytes or None
        """

        try:
            return self.project.loader.memory.load(addr, length)
        except KeyError:
            return None