Unify symbols sharing across native scripts and runtime.

src/collection.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.
 
 var $getHash;
 var $getExistingHash;
 
 (function(global, utils) {
 "use strict";
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var GlobalMap = global.Map;
 var GlobalObject = global.Object;
 var GlobalSet = global.Set;
+var HashCodeSymbol = utils.GetPrivateSymbol("hash_code_symbol");
 var IntRandom;
 
 utils.Import(function(from) {
   IntRandom = from.IntRandom;
 });
 
 var NumberIsNaN;
 
 utils.Import(function(from) {
   NumberIsNaN = from.NumberIsNaN;
@@ skipping 54 matching lines @@
   hash = ~hash + (hash << 15);  // hash = (hash << 15) - hash - 1;
   hash = hash ^ (hash >>> 12);
   hash = hash + (hash << 2);
   hash = hash ^ (hash >>> 4);
   hash = (hash * 2057) | 0;  // hash = (hash + (hash << 3)) + (hash << 11);
   hash = hash ^ (hash >>> 16);
   return hash & 0x3fffffff;
 }
 %SetForceInlineFlag(ComputeIntegerHash);
 
-var hashCodeSymbol = GLOBAL_PRIVATE("hash_code_symbol");
-
 function GetExistingHash(key) {
   if (%_IsSmi(key)) {
     return ComputeIntegerHash(key, 0);
   }
   if (IS_STRING(key)) {
     var field = %_StringGetRawHashField(key);
     if ((field & 1 /* Name::kHashNotComputedMask */) === 0) {
       return field >>> 2 /* Name::kHashShift */;
     }
   } else if (IS_SPEC_OBJECT(key) && !%_IsJSProxy(key) && !IS_GLOBAL(key)) {
-    var hash = GET_PRIVATE(key, hashCodeSymbol);
+    var hash = GET_PRIVATE(key, HashCodeSymbol);
     return hash;
   }
   return %GenericHash(key);
 }
 %SetForceInlineFlag(GetExistingHash);
 
 
 function GetHash(key) {
   var hash = GetExistingHash(key);
   if (IS_UNDEFINED(hash)) {
     hash = IntRandom() | 0;
     if (hash === 0) hash = 1;
-    SET_PRIVATE(key, hashCodeSymbol, hash);
+    SET_PRIVATE(key, HashCodeSymbol, hash);
   }
   return hash;
 }
 %SetForceInlineFlag(GetHash);
 
 
 // -------------------------------------------------------------------
 // Harmony Set
 
 function SetConstructor(iterable) {
@@ skipping 380 matching lines @@
   to.MapHas = MapHas;
   to.MapDelete = MapDelete;
   to.SetAdd = SetAdd;
   to.SetHas = SetHas;
   to.SetDelete = SetDelete;
   to.MapFromArray = MapFromArray;
   to.SetFromArray = SetFromArray;
 });
 
 })