Add interceptor support for symbols

src/v8natives.js

 // Copyright 2012 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 file relies on the fact that the following declarations have been made
 // in runtime.js:
 // var $Object = global.Object;
 // var $Boolean = global.Boolean;
 // var $Number = global.Number;
 // var $Function = global.Function;
@@ skipping 1023 matching lines @@
     names[s] = 0;
   }
   array.length = realLength;
   return array;
 }
 
 
 function ObjectGetOwnPropertyKeys(obj, filter) {
   var nameArrays = new InternalArray();
   filter |= PROPERTY_ATTRIBUTES_PRIVATE_SYMBOL;
+  var interceptorInfo = %GetInterceptorInfo(obj);
 
   // Find all the indexed properties.
 
   // Only get own element names if we want to include string keys.
   if ((filter & PROPERTY_ATTRIBUTES_STRING) === 0) {
     var ownElementNames = %GetOwnElementNames(obj);
     for (var i = 0; i < ownElementNames.length; ++i) {
       ownElementNames[i] = %_NumberToString(ownElementNames[i]);
     }
     nameArrays.push(ownElementNames);
-
     // Get names for indexed interceptor properties.
-    var interceptorInfo = %GetInterceptorInfo(obj);
     if ((interceptorInfo & 1) != 0) {
       var indexedInterceptorNames = %GetIndexedInterceptorElementNames(obj);
       if (!IS_UNDEFINED(indexedInterceptorNames)) {
         nameArrays.push(indexedInterceptorNames);
       }
     }
   }
 
   // Find all the named properties.
 
@@ skipping 834 matching lines @@
   }
   if (!IS_SPEC_FUNCTION(method)) {
     throw MakeTypeError('not_iterable', [obj]);
   }
   var iterator = %_CallFunction(obj, method);
   if (!IS_SPEC_OBJECT(iterator)) {
     throw MakeTypeError('not_an_iterator', [iterator]);
   }
   return iterator;
 }