ES6: Add support for Map and Set Iterator

src/runtime.h

Index: src/runtime.h
diff --git a/src/runtime.h b/src/runtime.h
index 566a5ebeabef50f7c30c3f090752f0e2a8bc50b4..9fc4610651489588808ed68a275f74f40cc88373 100644
--- a/src/runtime.h
+++ b/src/runtime.h
@@ -272,8 +272,8 @@ namespace internal {
   F(SetDelete, 2, 1) \
   F(SetClear, 1, 1) \
   F(SetGetSize, 1, 1) \
-  F(SetCreateIterator, 2, 1) \
   \
+  F(SetIteratorInitialize, 3, 1) \
   F(SetIteratorNext, 1, 1) \
   \
   /* Harmony maps */ \
@@ -284,8 +284,8 @@ namespace internal {
   F(MapClear, 1, 1) \
   F(MapSet, 3, 1) \
   F(MapGetSize, 1, 1) \
-  F(MapCreateIterator, 2, 1) \
   \
+  F(MapIteratorInitialize, 3, 1) \
   F(MapIteratorNext, 1, 1) \
   \
   /* Harmony weak maps and sets */ \