Description:
------------
Accesses to uninitialized typed properties currently only throw an exception for R fetches, but not increments (https://3v4l.org/PPkFu) or compound assignment operators (https://3v4l.org/eHkLs). These should throw as well.

Salvaged from bug #78809, which had to be deleted due to inappropriate language.

Test script:
---------------
<?php

class Test {
    public int $i;
}
$test = new Test;
$test->i++;

Expected result:
----------------
Uncaught Error: Typed property Test::$i must not be accessed before initialization

Actual result:
--------------
Notice: Undefined property: Test::$i in /in/oqvf3 on line 7