[hl] Cannot extend @:structInit class with constructor in subclass

On HL, I am not able to extend a `@:structInit` class if the subclass has a constructor, receiving `Invalid_argument("List.map2")`. See below example, which works in try.haxe.org on JS but not HL.

```haxe
package;

class Main {

static public function main():Void {

// Invalid_argument("List.map2")
var b:B = new B();
trace(b.a);
}
}

@:structInit
class A {
public var a:Int;
}

class B extends A {
public function new() {
a = 1;
}
}
```

Occurs at least on Haxe 4.0.5 through 4.2.5 and 6bcae15, with HL 1.11