Revert of Migrate Object.prototype.valueOf to CSA

src/js/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.
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 // ----------------------------------------------------------------------------
 // Imports
@@ skipping 13 matching lines @@
 // ----------------------------------------------------------------------------
 // Object
 
 // ES6 19.1.3.5 Object.prototype.toLocaleString([reserved1 [,reserved2]])
 function ObjectToLocaleString() {
   CHECK_OBJECT_COERCIBLE(this, "Object.prototype.toLocaleString");
   return this.toString();
 }
 
 
+// ES6 19.1.3.7 Object.prototype.valueOf()
+function ObjectValueOf() {
+  return TO_OBJECT(this);
+}
+
+
 // ES6 19.1.3.3 Object.prototype.isPrototypeOf(V)
 function ObjectIsPrototypeOf(V) {
   if (!IS_RECEIVER(V)) return false;
   var O = TO_OBJECT(this);
   return %HasInPrototypeChain(V, O);
 }
 
 
 // ES6 7.3.9
 function GetMethod(obj, p) {
@@ skipping 19 matching lines @@
 %SetNativeFlag(GlobalObject);
 %SetCode(GlobalObject, ObjectConstructor);
 
 %AddNamedProperty(GlobalObject.prototype, "constructor", GlobalObject,
                   DONT_ENUM);
 
 // Set up non-enumerable functions on the Object.prototype object.
 utils.InstallFunctions(GlobalObject.prototype, DONT_ENUM, [
   "toString", ObjectToString,
   "toLocaleString", ObjectToLocaleString,
-  // valueOf is added in bootstrapper.cc.
+  "valueOf", ObjectValueOf,
   "isPrototypeOf", ObjectIsPrototypeOf,
   // propertyIsEnumerable is added in bootstrapper.cc.
   // __defineGetter__ is added in bootstrapper.cc.
   // __lookupGetter__ is added in bootstrapper.cc.
   // __defineSetter__ is added in bootstrapper.cc.
   // __lookupSetter__ is added in bootstrapper.cc.
 ]);
 
 
 // ----------------------------------------------------------------------------
@@ skipping 16 matching lines @@
 
 // ----------------------------------------------------------------------------
 // Exports
 
 utils.Export(function(to) {
   to.GetIterator = GetIterator;
   to.GetMethod = GetMethod;
   to.ObjectHasOwnProperty = GlobalObject.prototype.hasOwnProperty;
 });
 
+%InstallToContext([
+  "object_value_of", ObjectValueOf,
+]);
+
 })