Fixed ADD_INTERNED_STRING() logic to support strings that are already interned. (Terry)
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  Fixed ADD_INTERNED_STRING() logic to support strings that are already interned. (Terry)
Merge branch 'PHP-5.6'

* PHP-5.6:
  Fixed ADD_INTERNED_STRING() logic to support strings that are already interned. (Terry)