Enable ES6 Map and Set by default

test/mjsunit/builtins.js

Index: test/mjsunit/builtins.js
diff --git a/test/mjsunit/builtins.js b/test/mjsunit/builtins.js
index ce2c6802f0716b4f1f57ccfb4fc3a8aa3c32aca9..3c92af82509b34b2fa2502d6174c61efd5ba5d75 100644
--- a/test/mjsunit/builtins.js
+++ b/test/mjsunit/builtins.js
@@ -38,6 +38,12 @@ function isFunction(obj) {
   return typeof obj == "function";
 }
 
+function isV8Native(name) {
+  return name == "GeneratorFunctionPrototype" ||
+      name == "SetIterator" ||
+      name == "MapIterator";
+}
+
 function checkConstructor(func, name) {
   // A constructor is a function with a prototype and properties on the
   // prototype object besides "constructor";
@@ -54,12 +60,13 @@ function checkConstructor(func, name) {
   assertFalse(proto_desc.writable, name);
   assertFalse(proto_desc.configurable, name);
   var prototype = proto_desc.value;
-  assertEquals(name == "GeneratorFunctionPrototype" ? Object.prototype : null,
+  assertEquals(isV8Native(name) ? Object.prototype : null,
                Object.getPrototypeOf(prototype),
                name);
   for (var i = 0; i < propNames.length; i++) {
     var propName = propNames[i];
     if (propName == "constructor") continue;
+    if (isV8Native(name)) continue;
     var testName = name + "-" + propName;
     var propDesc = Object.getOwnPropertyDescriptor(prototype, propName);
     assertTrue(propDesc.hasOwnProperty("value"), testName);