Description:
------------
In the PHP_5_3 branch, the __autoload() function is not triggered for classes that are used in method signatures.

Reproduce code:
---------------
<?php
function __autoload($className)
{
    print '*';
}

class a
{
    public static function b($c = d::constant)
    {
    }
}

a::b();

Expected result:
----------------
sb@vmware ~ % /usr/local/php-5.2/bin/php -n test.php
*
Fatal error: Class 'd' not found in /home/sb/test.php on line 9

Actual result:
--------------
sb@vmware ~ % /usr/local/php-5.3/bin/php -n test.php

Fatal error: Class 'd' not found in /home/sb/test.php on line 9