Description:
------------
ReflectionReference must have a bug with zval that have is_ref=1 but refcount=1

Test script:
---------------
$a = [1, 2];

foreach ($a as &$v) {
}

// This should return null but instead it returns a ReflectionReference.
// a few lines below, $b[0] becomes a reference to $a[0]
// while this is not the case when this line is commented.
$r = ReflectionReference::fromArrayElement($a, 0);

$b = $a;
$b[0] = 123;

var_dump($a);
var_dump($b);


Expected result:
----------------
array(2) {
  [0]=>
  int(1)
  [1]=>
  &int(2)
}
array(2) {
  [0]=>
  int(123)
  [1]=>
  &int(2)
}


Actual result:
--------------
array(2) {
  [0]=>
  &int(123)
  [1]=>
  &int(2)
}
array(2) {
  [0]=>
  &int(123)
  [1]=>
  &int(2)
}