Description:
------------
Wrong code in spl_heap_object_new_ex() increments reference counters of elements twice.

Test script:
---------------
<?php
$q1 = new SplPriorityQueue();
$a = 1;
$q1->insert([$a], 1);
$q1->insert([$a], 2);
$q2 = clone $q1;
echo "ok\n";
?>


Expected result:
----------------
ok
[without memory leaks]

Actual result:
--------------
ok
[memory leaks]