Description:
------------
This bug seems to be related to #5401.  Certain class hierarchies produce a Fatal Error when loading.  I experience this error using the Swift mailing library (version 4.0.6) when creating an attachment before creating a message.

To simulate this (without the Swift library), create the following files:

Aa.php
------
<?php
class Aa extends Base
{
}


Ba.php
------
<?php
class Ba extends Bb implements Ib
{
}


Bb.php
------
<?php
class Bb extends Base
{
}


Base.php
--------
<?php
class Base implements Ia
{
}


Ia.php
------
<?php
interface Ia
{
  const LEVEL_TOP = 16;
}


Ib.php
------
<?php
interface Ib extends Ia
{
}


bug.php
-------
<?php

require_once "Ia.php";
require_once "Base.php";
require_once "Aa.php";
$a = new Aa();

require_once "Ib.php";
require_once "Bb.php";
require_once "Ba.php";
$b = new Ba();

echo "Hello World";



Finally, restart Apache (or clear your APC cache) and load bug.php.  You should see "Hello World".  Now refresh the page.  Instead of "Hello World", you should get a
Fatal error: Cannot inherit previously-inherited or override constant LEVEL_TOP from interface Ib in /var/www/localhost/htdocs/apctest/Ba.php on line 5 


I've seen this with PHP 5.3.2 and PHP 5.2.12 with APC 3.1.3p1.

BTW: The test case in #5401 works correctly for me, so while this bug seems similar, it doesn't look the same bug.

Expected result:
----------------
Hello World

Actual result:
--------------
First run:
Hello World


Second run:
Fatal error: Cannot inherit previously-inherited or override constant LEVEL_TOP from interface Ib in /var/www/localhost/htdocs/apctest/Ba.php on line 5