* Identify the ones that are passing and stop skipping them.
* Flatten out the main behavior.zig file and have each individual test
disable itself if it is not passing.
- This implements the float_to_int AIR instruction.
- Lowering a decl_ref to a slice was previously assumed to contain a pointer
to a slice, rather than an array. This is now fixed, making `@src()` work as well.
- Some preliminary work on 128bit integers have been done to find out what needs to be done
to implement 128bit arithmetic.
