Don't ignore passed attributes in InstallGetterSetter

src/js/prologue.js

 // Copyright 2015 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, extrasUtils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 102 matching lines @@
 
 
 // Helper function to install a getter/setter accessor property.
 function InstallGetterSetter(object, name, getter, setter, attributes) {
   %CheckIsBootstrapping();
   if (IS_UNDEFINED(attributes)) attributes = DONT_ENUM;
   SetFunctionName(getter, name, "get");
   SetFunctionName(setter, name, "set");
   %FunctionRemovePrototype(getter);
   %FunctionRemovePrototype(setter);
-  %DefineAccessorPropertyUnchecked(object, name, getter, setter, DONT_ENUM);
+  %DefineAccessorPropertyUnchecked(object, name, getter, setter, attributes);
   %SetNativeFlag(getter);
   %SetNativeFlag(setter);
 }
 
 
 function OverrideFunction(object, name, f, afterInitialBootstrap) {
   %CheckIsBootstrapping();
   %object_define_property(object, name, { value: f,
                                           writeable: true,
                                           configurable: true,
@@ skipping 219 matching lines @@
 
 extrasUtils.uncurryThis = function uncurryThis(func) {
   return function(thisArg, ...args) {
     return %reflect_apply(func, thisArg, args);
   };
 };
 
 %ToFastProperties(extrasUtils);
 
 })