Optimization: static conditionals should modify code

[velipso]

Something like this:

if 1
    say 'hi'
end

Should transform to:

do
    say 'hi'
end

I would just do this now, but there is additional complexity dealing with elseif and else.

[velipso]

The hard part about this is that I can't remove the code quickly. I still have to evaluate it at compile-time for correctness. That's very annoying, since correctness is done during code generation.

[velipso]

Also, goto needs to be taken into account:

if nil
    label:
    say 'hi'
end
goto label

[velipso]

Skipping this, too complicated, and not convinced this is actually useful for small scripts in the first place.