__bytecode__ support?

Flash's compiler supports the `__bytecode__` function for inline bytecode, detailed [here](http://www.nowrap.de/flasm.html#__bytecode__) and in its linked posts. Compared to Rascal's PCode syntax, this can give more freedom such as unlabelled jumps, which are used in https://github.com/ruffle-rs/ruffle/pull/23160