Description:
------------
The Function get_called_class works not as expected.
the new introduced static call works correct, the self call too but if you call the demo class with parent you dont get foo as result. This should be so because its not possible to overwrite a existing class in a  static class with late static binding.

get_called_class() should return in every call 'foo' and not as shown with parent::demo() a 'bar'



Reproduce code:
---------------
<?php
abstract class bar
{
    public static function demo()
    {
        var_dump(get_called_class());
    }
}

class foo extends bar
{
    public static function parent_demo()
    {
        parent::demo();
    }
    public static function self_demo()
    {
        self::demo();
    }
    public static function static_demo()
    {
        static::demo();
    }
}

echo 'bar::demo()' . PHP_EOL;
bar::demo();
echo 'foo::demo()' . PHP_EOL;
foo::demo();
echo 'foo::parent_demo()' . PHP_EOL;
foo::parent_demo();
echo 'foo::self_demo()' . PHP_EOL;
foo::self_demo();
echo 'foo::static_demo()' . PHP_EOL;
foo::static_demo();


?>

Expected result:
----------------
bar::demo()
string(3) "bar"
foo::demo()
string(3) "foo"
foo::parent_demo()
string(3) "bar"
foo::self_demo()
string(3) "foo"
foo::static_demo()
string(3) "foo"

Actual result:
--------------
bar::demo()
string(3) "bar"
foo::demo()
string(3) "foo"
foo::parent_demo()
string(3) "foo"
foo::self_demo()
string(3) "foo"
foo::static_demo()
string(3) "foo"