[2.3] Remove most refs uses

Author: nicolas-grekas

ContainerBuilder.php

@@ -997,9 +997,7 @@ public function createService(Definition $definition, $id, $tryProxy = true)
     public function resolveServices($value)
     {
         if (is_array($value)) {
-            foreach ($value as &$v) {
-                $v = $this->resolveServices($v);
-            }
+            $value = array_map(array($this, 'resolveServices'), $value);
         } elseif ($value instanceof Reference) {
             $value = $this->get((string) $value, $value->getInvalidBehavior());
         } elseif ($value instanceof Definition) {