array_values dropped references

It should preserve them. This was breaking pass-by-reference
via ReflectionFunction::invokeArgs.

hphp/runtime/base/type_array.cpp

@@ -703,7 +703,7 @@ Array Array::keys(CVarRef search_value /* = null_variant */,
 Array Array::values() const {
   ArrayInit ai(size(), ArrayInit::vectorInit);
   for (ArrayIter iter(*this); iter; ++iter) {
-    ai.set(iter.secondRef());
+    ai.set(withRefBind(iter.secondRef()));
   }
   return ai.create();
 }

hphp/test/quick/array_values.php

@@ -0,0 +1,6 @@
+<?php
+
+$b = 'b';
+
+$a = array(&$b);
+var_dump(array_values($a));

hphp/test/quick/array_values.php.expect

@@ -0,0 +1,4 @@
+array(1) {
+  [0]=>
+  &string(1) "b"
+}