[proxies] Better print for proxies in d8

src/js/messages.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.
 
 // -------------------------------------------------------------------
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
@@ skipping 823 matching lines @@
       }
     }
     lines.push("    at " + line);
   }
   return %_Call(ArrayJoin, lines, "\n");
 }
 
 
 function GetTypeName(receiver, requireConstructor) {
   if (IS_NULL_OR_UNDEFINED(receiver)) return null;
-  if (%_IsJSProxy(receiver)) return "Proxy";
+  if (IS_PROXY(receiver)) return "Proxy";
 
   var constructor = %GetDataProperty(TO_OBJECT(receiver), "constructor");
   if (!IS_FUNCTION(constructor)) {
     return requireConstructor ? null : %_Call(NoSideEffectsToString, receiver);
   }
   return %FunctionGetName(constructor);
 }
 
 
 // Format the stack trace if not yet done, and return it.
@@ skipping 149 matching lines @@
 utils.Export(function(to) {
   to.ErrorToString = ErrorToString;
   to.MakeError = MakeError;
   to.MakeRangeError = MakeRangeError;
   to.MakeSyntaxError = MakeSyntaxError;
   to.MakeTypeError = MakeTypeError;
   to.MakeURIError = MakeURIError;
 });
 
 });