Call JS functions via native context instead of js builtins object.

src/templates.js

 // Copyright 2014 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.
 
 // Called from a desugaring in the parser.
 
-var $getTemplateCallSite;
-
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var GlobalMap = global.Map;
@@ skipping 41 matching lines @@
     array[0] = siteObj;
     %_CallFunction(callSiteCache, hash, array, mapSetFn);
   } else {
     obj.push(siteObj);
   }
 
   return siteObj;
 }
 
 
-$getTemplateCallSite = function(siteObj, rawStrings, hash) {
+function GetTemplateCallSite(siteObj, rawStrings, hash) {
   var cached = GetCachedCallSite(rawStrings, hash);
 
   if (!IS_UNDEFINED(cached)) return cached;
 
   %AddNamedProperty(siteObj, "raw", %ObjectFreeze(rawStrings),
       READ_ONLY | DONT_ENUM | DONT_DELETE);
 
   return SetCachedCallSite(%ObjectFreeze(siteObj), hash);
 }
 
+// ----------------------------------------------------------------------------
+// Exports
+
+%InstallToContext(["get_template_call_site", GetTemplateCallSite]);
+
 })