[builtins] Migrate Object.setPrototypeOf to C++.

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 86 matching lines @@
 
 
 // ES6 7.3.9
 function GetMethod(obj, p) {
   var func = obj[p];
   if (IS_NULL_OR_UNDEFINED(func)) return UNDEFINED;
   if (IS_CALLABLE(func)) return func;
   throw %make_type_error(kCalledNonCallable, typeof func);
 }
 
-// ES6 section 19.1.2.18.
-function ObjectSetPrototypeOf(obj, proto) {
-  CHECK_OBJECT_COERCIBLE(obj, "Object.setPrototypeOf");
-
-  if (proto !== null && !IS_RECEIVER(proto)) {
-    throw %make_type_error(kProtoObjectOrNull, proto);
-  }
-
-  if (IS_RECEIVER(obj)) {
-    %SetPrototype(obj, proto);
-  }
-
-  return obj;
-}
-
 // ES6 B.2.2.1.1
 function ObjectGetProto() {
   return %object_get_prototype_of(this);
 }
 
 
 // ES6 B.2.2.1.2
 function ObjectSetProto(proto) {
   CHECK_OBJECT_COERCIBLE(this, "Object.prototype.__proto__");
 
@@ skipping 30 matching lines @@
   "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.
 ]);
 utils.InstallGetterSetter(
     GlobalObject.prototype, "__proto__", ObjectGetProto, ObjectSetProto);
 
-// Set up non-enumerable functions in the Object object.
-utils.InstallFunctions(GlobalObject, DONT_ENUM, [
-  "setPrototypeOf", ObjectSetPrototypeOf,
-  // getOwnPropertySymbols is added in symbol.js.
-  // Others are added in bootstrapper.cc.
-]);
-
-
 
 // ----------------------------------------------------------------------------
 // Number
 
 utils.InstallConstants(GlobalNumber, [
   // ECMA-262 section 15.7.3.1.
   "MAX_VALUE", 1.7976931348623157e+308,
   // ECMA-262 section 15.7.3.2.
   "MIN_VALUE", 5e-324,
   // ECMA-262 section 15.7.3.3.
@@ skipping 42 matching lines @@
   to.GetIterator = GetIterator;
   to.GetMethod = GetMethod;
   to.ObjectHasOwnProperty = GlobalObject.prototype.hasOwnProperty;
 });
 
 %InstallToContext([
   "object_value_of", ObjectValueOf,
 ]);
 
 })