Description:
------------
Default values of constant static properties may be preloaded incorrectly.

Test script:
---------------
preload.inc
-----------
<?php
const CNST = 'aaaa';
class A {
	public static $a = CNST;
}
$a = \A::$a;
?>

bug.php
-------
<?php
var_dump(\A::$a);
?>

Expected result:
----------------
string(4) "aaaa"

Actual result:
--------------
UNKNOWN:0