@:generic ignores @:unreflective

When a Haxe class is annotated with both @:generic and @:unreflective, the corresponding C++ class still retains the reflection machinery.

For example, compiling the following code with these annotations generates a class named MyClass_Int.cpp, which contains declarations such as `HX_DEFINE_DYNAMIC_FUNC0(MyClass_Int_obj, get, return)`.

I am using Haxe 4.3.4 (but Haxe 4.3.3 exhibits the same behaviour).

```haxe
@:generic
@:unreflective
class MyClass {
var _v: T;
public function new(v: T) _v = v;
public function get() return _v;
}

class Main {
static function main() {
trace(new MyClass(1).get());
}
}
```