Unify setting accessor properties in native code.

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 84 matching lines @@
     SetFunctionName(f, key);
     %FunctionRemovePrototype(f);
     %AddNamedProperty(object, key, f, attributes);
     %SetNativeFlag(f);
   }
   %ToFastProperties(object);
 }
 
 
 // Helper function to install a getter-only accessor property.
-function InstallGetter(object, name, getter, attributes) {
+function InstallGetter(object, name, getter, attributes, prefix) {
   %CheckIsBootstrapping();
-  if (typeof attributes == "undefined") {
-    attributes = DONT_ENUM;
-  }
-  SetFunctionName(getter, name, "get");
+  if (IS_UNDEFINED(attributes)) attributes = DONT_ENUM;
+  SetFunctionName(getter, name, IS_UNDEFINED(prefix) ? "get" : prefix);
   %FunctionRemovePrototype(getter);
-  %DefineAccessorPropertyUnchecked(object, name, getter, null, attributes);
+  %DefineGetterPropertyUnchecked(object, name, getter, attributes);
   %SetNativeFlag(getter);
 }
 
 
 // Helper function to install a getter/setter accessor property.
-function InstallGetterSetter(object, name, getter, setter) {
+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);
   %SetNativeFlag(getter);
   %SetNativeFlag(setter);
 }
 
 
@@ skipping 217 matching lines @@
 
 extrasUtils.uncurryThis = function uncurryThis(func) {
   return function(thisArg) {
     return %Apply(func, thisArg, arguments, 1, arguments.length - 1);
   };
 };
 
 %ToFastProperties(extrasUtils);
 
 })