HXCPP_GC_MOVING in combination with HXCPP_ALIGN_ALLOC

When I run the following program built with HXCPP_GC_MOVING and HXCPP_ALIGN_ALLOC flags enabled, I get a segmentation fault. Commenting out one of them fixes the problem. Moreover , removing [these lines](https://github.com/HaxeFoundation/hxcpp/blob/54af892be2ca4c63988c99c9c524431af6c6f036/src/hx/gc/Immix.cpp#L3817C25-L3819C31) solves the problem, too.
### System info
- haxe 4.3.6
- hxcpp 4.3.68
- clang 19.1.4
- macOS Sequoia 15.1.1

### Main.hx
```Haxe
class Point {
public function new(x: Int, y: Int) {
this.x = x;
this.y = y;
}

public var x: Int;
public var y: Int;
}

final ITERATIONS = 10000000;

class Main {
private static final array: Array = [];

public static function addPoint(): Void {
array.push(new Point(array.length, array.length));
}

public static function main(): Void {
for (i in 0...ITERATIONS) {
addPoint();
}

final halfSize = Std.int(array.length / 2);

array.resize(halfSize);
for (i in 0...halfSize) {
addPoint();
}

var idx = Std.int(Math.random() * array.length);
trace('$idx == ${array[idx].x}');
}
}
```

### build.hxml
```hxml
-D HXCPP_GC_MOVING
-D HXCPP_ALIGN_ALLOC
-D HXCPP_API_LEVEL=430

-main Main
--cpp build
```