[utils] Improve int_or_none and float_or_none (#20403)

[youtube-dl] / test / swftests / ClassConstruction.as

// input: []
// output: 0

package {
public class ClassConstruction {
    public static function main():int{
        var f:Foo = new Foo();
        return 0;
    }
}
}

class Foo {

}