Install iterator meta objects via utils object.

src/js/prologue.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils, extrasUtils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 164 matching lines @@
     "InnerArrayLastIndexOf",
     "InnerArrayMap",
     "InnerArrayReduce",
     "InnerArrayReduceRight",
     "InnerArrayReverse",
     "InnerArraySome",
     "InnerArraySort",
     "InnerArrayToLocaleString",
     "IsNaN",
     "MapEntries",
+    "MapIterator",
     "MapIteratorNext",
     "MathMax",
     "MathMin",
     "ObjectIsFrozen",
     "ObjectDefineProperty",
     "ObserveArrayMethods",
     "ObserveObjectMethods",
     "OwnPropertyKeys",
+    "SameValueZero",
+    "SetIterator",
     "SetIteratorNext",
     "SetValues",
     "SymbolToString",
     "ToNameArray",
     "ToPositiveInteger",
     // From runtime:
     "is_concat_spreadable_symbol",
     "iterator_symbol",
     "promise_status_symbol",
     "promise_value_symbol",
@@ skipping 20 matching lines @@
   %CheckIsBootstrapping();
   %ExportExperimentalFromRuntime(exports_container);
   for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
     imports(exports_container);
   }
   for ( ; !IS_UNDEFINED(imports_from_experimental);
           imports_from_experimental = imports_from_experimental.next) {
     imports_from_experimental(exports_container);
   }
 
-  exports_container = UNDEFINED;
-
+  utils.Export = UNDEFINED;
+  utils.PostDebug = UNDEFINED;
   utils.PostExperimentals = UNDEFINED;
-  utils.PostDebug = UNDEFINED;
-  utils.Import = UNDEFINED;
-  utils.Export = UNDEFINED;
 }
 
 
 function PostDebug(utils) {
   for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
     imports(exports_container);
   }
 
   exports_container = UNDEFINED;
 
+  utils.Export = UNDEFINED;
+  utils.Import = UNDEFINED;
+  utils.ImportNow = UNDEFINED;
   utils.PostDebug = UNDEFINED;
   utils.PostExperimentals = UNDEFINED;
-  utils.Import = UNDEFINED;
-  utils.Export = UNDEFINED;
 }
 
+
 // -----------------------------------------------------------------------
 
 %OptimizeObjectForAddingMultipleProperties(utils, 13);
 
 utils.Import = Import;
 utils.ImportNow = ImportNow;
 utils.Export = Export;
 utils.ImportFromExperimental = ImportFromExperimental;
 utils.SetFunctionName = SetFunctionName;
 utils.InstallConstants = InstallConstants;
@@ skipping 46 matching lines @@
 
 extrasUtils.uncurryThis = function uncurryThis(func) {
   return function(thisArg) {
     return %Apply(func, thisArg, arguments, 1, arguments.length - 1);
   };
 };
 
 %ToFastProperties(extrasUtils);
 
 })