### Godot version

v4.0.3.stable.official [5222a99f5]
Master [6101240231600c871f5c5473872532c68ea3268c] (confirmed by https://github.com/godotengine/godot/issues/77666#issuecomment-1568952502)

### System information

Window 10

### Issue description

References are not unreferenced at the end of `if` scopes.

### Steps to reproduce

Copy, paste and run the snippet below, check the results:

```gdscript
extends Node


func _ready() -> void:
  var ref := RefCounted.new()
  var ref_count : int

  # OK
  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)

  # OK
  if true:
    var temp := ref
    temp = null

  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)

  # FAIL
  if true:
    var temp := ref

  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)
```

Output example:

```
Expected: 1, Result: 1
Expected: 1, Result: 1
Expected: 1, Result: 2
```

### Minimal reproduction project

N/A
if (!p_arg_type.has_type) {
		return false;
	}
	if (p_par_type.type == Variant::NIL) {
		return false;
	}
	if (p_par_type.type == Variant::OBJECT) {
		if (p_arg_type.kind == GDScriptDataType::BUILTIN) {
			return false;
		}
		StringName class_name;
		if (p_arg_type.kind == GDScriptDataType::NATIVE) {
			class_name = p_arg_type.native_type;
		} else {
			class_name = p_arg_type.native_type == StringName() ? p_arg_type.script_type->get_instance_base_type() : p_arg_type.native_type;
		}
		return p_par_type.class_name == class_name || ClassDB::is_parent_class(class_name, p_par_type.class_name);
	} else {
		if (p_arg_type.kind != GDScriptDataType::BUILTIN) {
			return false;
		}
		return p_par_type.type == p_arg_type.builtin_type;
	}
}
static bool _can_use_ptrcall(const MethodBind *p_method, const Vector<GDScriptCodeGenerator::Address> &p_arguments) {