Description:
------------
When extending PDOStatement, it looks like PHP's engine doesn't know anything about a possible __call() method into it.
#43663 was the same but for PDO instances

Reproduce code:
---------------
class Mystatement extends PDOStatement 
{
    public function __call($m, $a)
    {
        echo "called $m";
    }
}
$pdo = new PDO('mysql:host=localhost;dbname=myDB','login','secret');
$pdo->setAttribute(PDO::ATTR_STATEMENT_CLASS, array('Mystatement'));

$s = $pdo->query("SELECT * FROM members"); // should be OK

$s->idontexist();

Expected result:
----------------
called idontexist

Actual result:
--------------
Fatal error: Call to undefined method Mystatement::idontexist() in XXX on line xxxx