Bytecode is 16-bits. AMAZING MEMORY USE REDUCTION IN SANITY.

uintptr_t is 64 bits on my system. I assumed that the memory reduction would
be significant, because bytecode takes a lot of memory. But I thought that
signatures and values took up a significant portion of memory. I was wrong.

(Numbers reported by valgrind)
sanity.ly, before: 402,872 (402 KB).

After...

208,370 (208 KB).

It's...very close to half of the entire memory use. This is far above and
beyond what I expected in memory savings. I made sure that this did not break
mod_lily.

Wow. Just...wow.