Description:
------------
Constants loaded with apc_load_constants are not shown in 
get_defined_constants

Reproduce code:
---------------
<?php

$constants = array(
    'ONE'  => 1,
    'TWO'  => 2,
    'THREE' => 3,
);
apc_define_constants('numbers', $constants);
apc_load_constants('numbers');
echo ONE, TWO, THREE;

echo "is 'ONE' defined ? " . (int) defined('ONE');

$constants = get_defined_constants(true);

echo "Defined constants: " .  count($constants['user']) . "\n";

print_r($constants['user']);

?>

Expected result:
----------------
123
is 'ONE' defined ? 1
Defined constants: 3
Array
(
    [ONE] => 1
    [TWO] => 2
    [THREE] => 3
)

Actual result:
--------------
123
is 'ONE' defined ? 1
Defined constants: 0
(print_r prints nothing here)