ES6: Add support for Map and Set Iterator

test/mjsunit/runtime-gen/setiteratorinitialize.js

Index: test/mjsunit/runtime-gen/setiteratorinitialize.js
diff --git a/test/mjsunit/runtime-gen/arraybufferisview.js b/test/mjsunit/runtime-gen/setiteratorinitialize.js
similarity index 60%
copy from test/mjsunit/runtime-gen/arraybufferisview.js
copy to test/mjsunit/runtime-gen/setiteratorinitialize.js
index def6b3be00071af822eb9ae4f220ee828d261183..9cf36b49119078f6a06544e1709da96d01dc6fd1 100644
--- a/test/mjsunit/runtime-gen/arraybufferisview.js
+++ b/test/mjsunit/runtime-gen/setiteratorinitialize.js
@@ -1,5 +1,7 @@
 // Copyright 2014 the V8 project authors. All rights reserved.
 // AUTO-GENERATED BY tools/generate-runtime-tests.py, DO NOT MODIFY
 // Flags: --allow-natives-syntax --harmony
-var _object = new Object();
-%ArrayBufferIsView(_object);
+var _holder = new Set().values();
+var _set = new Set();
+var arg2 = 2;
+%SetIteratorInitialize(_holder, _set, arg2);