Description:
------------
when a reflector is stored in a class property, the reflector appears to stay in memory after the object is destroyed. This could be related to #33595

Reproduce code:
---------------
class testclass {

   protected $_r;

   public function __construct() {

     $this->getr();

   }


   public function getr() {

     if ( !$this->_r ) $this->_r = new ReflectionObject($this);

     return $this->_r;

   }

}

for ( $j = 0; $j < 100; $j++ ) {

  $t = new testclass();
  echo memory_get_usage() . '<br />';
}



Expected result:
----------------
memory usage should stay constant

Actual result:
--------------
memory usage increases with every iteration