Description:
------------
When defining the __clone magic method as private, the instance cannot be cloned from within the method implementing parent class.

Test script:
---------------
class a {
    private function __clone()
    {
        
    }
    
    private function __construct()
    {
        
    }
    
    public static function getInstance()
    {
        return new static();
    }
    
    public function cloneIt()
    {
        $a = clone $this;
        
        return $a;
    }
}

class c extends a {

}

// private constructor
$d = c::getInstance();

// private clone
$e = $d->cloneIt();

Link to 3v4l: https://3v4l.org/bWr72

Expected result:
----------------
Expecting the same behavior as for __construct: a successfully cloned object.

Actual result:
--------------
The following misleading fatal error is thrown:
Fatal error: Uncaught Error: Call to private c::__clone() from context 'a'

which is not the case as clone is called from a context and not c.