Move ErrorToString to runtime

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 97 matching lines @@
     "column_offset"
   ], [
     "locationFromPosition", ScriptLocationFromPosition,
     "nameOrSourceURL", ScriptNameOrSourceURL,
   ]
 );
 
 // ----------------------------------------------------------------------------
 // Error implementation
 
-function ErrorToString() {
-  if (!IS_RECEIVER(this)) {
-    throw MakeTypeError(kCalledOnNonObject, "Error.prototype.toString");
-  }
-
-  var name = this.name;
-  name = IS_UNDEFINED(name) ? "Error" : TO_STRING(name);
-
-  var message = this.message;
-  message = IS_UNDEFINED(message) ? "" : TO_STRING(message);
-
-  if (name == "") return message;
-  if (message == "") return name;
-  return `${name}: ${message}`
-}
-
 function MakeError(type, arg0, arg1, arg2) {
   return MakeGenericError(GlobalError, type, arg0, arg1, arg2);
 }
 
 function MakeRangeError(type, arg0, arg1, arg2) {
   return MakeGenericError(GlobalRangeError, type, arg0, arg1, arg2);
 }
 
 function MakeSyntaxError(type, arg0, arg1, arg2) {
   return MakeGenericError(GlobalSyntaxError, type, arg0, arg1, arg2);
 }
 
 function MakeTypeError(type, arg0, arg1, arg2) {
   return MakeGenericError(GlobalTypeError, type, arg0, arg1, arg2);
 }
 
 function MakeURIError() {
   return MakeGenericError(GlobalURIError, kURIMalformed);
 }
 
 %InstallToContext([
   "make_range_error", MakeRangeError,
   "make_type_error", MakeTypeError,
   "message_get_column_number", GetColumnNumber,
   "message_get_line_number", GetLineNumber,
   "message_get_source_line", GetSourceLine,
 ]);
 
 utils.Export(function(to) {
-  to.ErrorToString = ErrorToString;
   to.MakeError = MakeError;
   to.MakeRangeError = MakeRangeError;
   to.MakeSyntaxError = MakeSyntaxError;
   to.MakeTypeError = MakeTypeError;
   to.MakeURIError = MakeURIError;
 });
 
 });