Use import/export for more functions (instead of js builtins object).

src/js/runtime.js

 // Copyright 2006-2008 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.
 
 // This files contains runtime support implemented in JavaScript.
 
 // CAUTION: Some of the functions specified in this file are called
 // directly from compiled code. These are the functions with names in
 // ALL CAPS. The compiled code passes the first argument in 'this'.
 
 
 // The following declarations are shared with other native JS files.
 // They are all declared at this one spot to avoid redeclaration errors.
-var $NaN;
 var $sameValue;
 var $sameValueZero;
-var $toPositiveInteger;
 
 var harmony_tolength = false;
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 var GlobalArray = global.Array;
 var GlobalBoolean = global.Boolean;
 var GlobalString = global.String;
@@ skipping 199 matching lines @@
 // NOTE: Setting the prototype for Array must take place as early as
 // possible due to code generation for array literals.  When
 // generating code for a array literal a boilerplate array is created
 // that is cloned when running the code.  It is essential that the
 // boilerplate gets the right prototype.
 %FunctionSetPrototype(GlobalArray, new GlobalArray(0));
 
 // ----------------------------------------------------------------------------
 // Exports
 
-$NaN = %GetRootNaN();
 $sameValue = SameValue;
 $sameValueZero = SameValueZero;
-$toPositiveInteger = ToPositiveInteger;
+
+utils.Export(function(to) {
+  to.ToPositiveInteger = ToPositiveInteger;
+});
 
 %InstallToContext([
   "apply_prepare_builtin", APPLY_PREPARE,
   "concat_iterable_to_array_builtin", CONCAT_ITERABLE_TO_ARRAY,
   "reflect_apply_prepare_builtin", REFLECT_APPLY_PREPARE,
   "reflect_construct_prepare_builtin", REFLECT_CONSTRUCT_PREPARE,
 ]);
 
 %InstallToContext([
   "concat_iterable_to_array", ConcatIterableToArray,
 ]);
 
 })