Compiler not inferring array type correctly in ternary operation

This can be reproduced with
```haxe
class Test {
static function main() {
var c = Math.random() > 0.5 ? [new Base(), new Sub()] : [new Sub()];
}
}

class Base {
public function new() { }
}

class Sub extends Base {
public function new() { super(); }
}
```
(http://try-haxe.mrcdk.com/#2616f)