Description:
------------
If in a base class "Simple" to add a method "__call", at its call in an inherited class "Simple2" the Apache crashes.

Reproduce code:
---------------
class Simple
{
    public function foo()
    {
        return "foo!";
    }
}

class Simple2 extends Simple
{
    public function foo()
    {
        return "foo2";
    }
}

$__call = 'return call_user_func_array(array($this, "prefix_".$method), $args);';

runkit_method_add('Simple', '__call', '$method, $args = array()', $__call, RUNKIT_ACC_PUBLIC);

runkit_method_rename('Simple2', 'foo', 'prefix_foo');

$simple = new Simple2();

$simple->foo();