Description:
------------
Hi,

When I use the "self::" syntax in function parameter - or a in  a constant - the reflection API fails to find the constant.

Note that when using Foo::X, it works.

Reproduce code:
---------------
class Foo {
  const X = 1;
  const Y = self::X;
  
  function f($f = self::X) {}
}
$clazz = new ReflectionClass('Foo');

Expected result:
----------------
No notice

Actual result:
--------------
Notice: Use of undefined constant self::X - assumed 'self::X' in admintools\tests\testmaker.php on line 31

Notice: Use of undefined constant self::X - assumed 'self::X' in admintools\tests\testmaker.php on line 31