WARN: Logical expression, do not apply the second operand if not needed?

[keyvank]

Imagine these two if statements:

if(false && f()) {
}
if(true && f()) {
}

in 30cc, f() is evaluated twice, thus its side-effects are applied twice, but in regular C, only the f() in the second if-statement is applied.

[ookami125]

I have a hackish implementation of short circuiting here while this contains some stuff from my refactor I think the general idea should still work of breaking out the short circuiting things out into a new function and processing everything there. It was basically a copy of the normal function, chop out all the unneeded bits and then shit the binop->right->apply till after the result of the left has been checked.

[keyvank]

@ookami125 Thanks! Please make this a PR! :)