Use function wrapper argument to expose internal arrays to native scripts.

src/harmony-spread.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.
 
 var $spreadArguments;
 var $spreadIterable;
 
-(function(global, shared, exports) {
+(function(global, exports) {
 
 'use strict';
 
+// -------------------------------------------------------------------
+// Imports
+var InternalArray = exports.InternalArray;
+
+// -------------------------------------------------------------------
+
 function SpreadArguments() {
   var count = %_ArgumentsLength();
   var args = new InternalArray();
 
   for (var i = 0; i < count; ++i) {
     var array = %_Arguments(i);
     var length = array.length;
     for (var j = 0; j < length; ++j) {
       args.push(array[j]);
     }
@@ skipping 12 matching lines @@
   for (var value of collection) {
     args.push(value);
   }
   return args;
 }
 
 $spreadArguments = SpreadArguments;
 $spreadIterable = SpreadIterable;
 
 })