Description:
------------
stream_wrapper_register does not call the new __autoload function of Zend Engine 2.

Reproduce code:
---------------
VariableStream.class.php:
<?php 
class VariableStream {
    function __call() {}
}
?>

index.php:
<?php
function __autoload( $class ) {
    echo $class;
    include_once( $class . '.class.php' );
}

stream_wrapper_register( 'var', 'VariableStream' );
?>

Expected result:
----------------
VariableStream

Actual result:
--------------
Warning: stream_wrapper_register() [function.stream-wrapper-register]: class 'VariableStream' is undefined in index.php on line 6