[runtime] Remove useless %_IsUndetectableObject intrinsic.

src/v8natives.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.
 
 var $functionSourceString;
 var $globalEval;
 var $objectDefineOwnProperty;
 var $objectGetOwnPropertyDescriptor;
 var $toCompletePropertyDescriptor;
 
@@ skipping 121 matching lines @@
   "parseFloat", GlobalParseFloat,
   "eval", GlobalEval
 ]);
 
 
 // ----------------------------------------------------------------------------
 // Object
 
 // ECMA-262 - 15.2.4.2
 function ObjectToString() {
-  if (IS_UNDEFINED(this) && !IS_UNDETECTABLE(this)) return "[object Undefined]";
+  if (IS_UNDEFINED(this)) return "[object Undefined]";
   if (IS_NULL(this)) return "[object Null]";
   var O = TO_OBJECT(this);
   var builtinTag = %_ClassOf(O);
   var tag;
 
   // TODO(caitp): cannot wait to get rid of this flag :>
   if (harmony_tostring) {
     tag = O[symbolToStringTag];
     if (!IS_STRING(tag)) {
       tag = builtinTag;
@@ skipping 53 matching lines @@
     var desc = GetOwnPropertyJS(this, P);
     return IS_UNDEFINED(desc) ? false : desc.isEnumerable();
   }
   return %IsPropertyEnumerable(TO_OBJECT(this), P);
 }
 
 
 // Extensions for providing property getters and setters.
 function ObjectDefineGetter(name, fun) {
   var receiver = this;
-  if (receiver == null && !IS_UNDETECTABLE(receiver)) {
+  if (IS_NULL(receiver) || IS_UNDEFINED(receiver)) {
     receiver = %GlobalProxy(ObjectDefineGetter);
   }
   if (!IS_SPEC_FUNCTION(fun)) {
     throw MakeTypeError(kObjectGetterExpectingFunction);
   }
   var desc = new PropertyDescriptor();
   desc.setGet(fun);
   desc.setEnumerable(true);
   desc.setConfigurable(true);
   DefineOwnProperty(TO_OBJECT(receiver), $toName(name), desc, false);
 }
 
 
 function ObjectLookupGetter(name) {
   var receiver = this;
-  if (receiver == null && !IS_UNDETECTABLE(receiver)) {
+  if (IS_NULL(receiver) || IS_UNDEFINED(receiver)) {
     receiver = %GlobalProxy(ObjectLookupGetter);
   }
   return %LookupAccessor(TO_OBJECT(receiver), $toName(name), GETTER);
 }
 
 
 function ObjectDefineSetter(name, fun) {
   var receiver = this;
-  if (receiver == null && !IS_UNDETECTABLE(receiver)) {
+  if (IS_NULL(receiver) || IS_UNDEFINED(receiver)) {
     receiver = %GlobalProxy(ObjectDefineSetter);
   }
   if (!IS_SPEC_FUNCTION(fun)) {
     throw MakeTypeError(kObjectSetterExpectingFunction);
   }
   var desc = new PropertyDescriptor();
   desc.setSet(fun);
   desc.setEnumerable(true);
   desc.setConfigurable(true);
   DefineOwnProperty(TO_OBJECT(receiver), $toName(name), desc, false);
 }
 
 
 function ObjectLookupSetter(name) {
   var receiver = this;
-  if (receiver == null && !IS_UNDETECTABLE(receiver)) {
+  if (IS_NULL(receiver) || IS_UNDEFINED(receiver)) {
     receiver = %GlobalProxy(ObjectLookupSetter);
   }
   return %LookupAccessor(TO_OBJECT(receiver), $toName(name), SETTER);
 }
 
 
 function ObjectKeys(obj) {
   obj = TO_OBJECT(obj);
   if (%_IsJSProxy(obj)) {
     var handler = %GetHandler(obj);
@@ skipping 1540 matching lines @@
   to.ObjectGetOwnPropertyKeys = ObjectGetOwnPropertyKeys;
   to.ObjectHasOwnProperty = ObjectHasOwnProperty;
   to.ObjectIsFrozen = ObjectIsFrozen;
   to.ObjectIsSealed = ObjectIsSealed;
   to.ObjectToString = ObjectToString;
   to.OwnPropertyKeys = OwnPropertyKeys;
   to.ToNameArray = ToNameArray;
 });
 
 })