Description:
------------
Using master rev. be5337421680f059f7b23dd530645e070b15715a the array_multisort have incorrect behavior if the SORT direction flag is passed in a variable.

This behavior is ok on HHVM and until PHP 5.6. See http://3v4l.org/7pU0u

Test script:
---------------
// Works
$values = array("Lindsay", "Nate");
array_multisort($values, SORT_DESC, SORT_REGULAR, array(0, 1), SORT_DESC, SORT_REGULAR);
var_dump($values);

// Doesn't work
$values = array("Lindsay", "Nate");
$dir = SORT_DESC;
array_multisort($values, $dir, SORT_REGULAR, array(0, 1), $dir, SORT_REGULAR);
var_dump($values);

Expected result:
----------------
array(2) {
  [0]=>
  string(4) "Nate"
  [1]=>
  string(7) "Lindsay"
}
array(2) {
  [0]=>
  string(4) "Nate"
  [1]=>
  string(7) "Lindsay"
}

Actual result:
--------------
array(2) {
  [0]=>
  string(4) "Nate"
  [1]=>
  string(7) "Lindsay"
}
array(2) {
  [0]=>
  string(7) "Lindsay"
  [1]=>
  string(4) "Nate"
}