List literals.
Subscript operator for lists.
Add optional support for computed gotos.

In my benchmark, this gives like a 5% speed boost. But I'm not sure
it's taking full advantage of it. The XCode project is using LLVM,
which has support for it, but may not optimize it as much as GCC.

There are also some GCC flags I may need to set (-fno-gcse?) to get the
best perf on GCC. Needs more investigation.