[builtins] Properly optimize Object.prototype.isPrototypeOf.

src/bootstrapper.cc

 // Copyright 2014 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.
 
 #include "src/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/ieee754.h"
 #include "src/code-stubs.h"
@@ skipping 1313 matching lines @@
                           "__defineSetter__", Builtins::kObjectDefineSetter, 2,
                           true);
     SimpleInstallFunction(isolate->initial_object_prototype(), "hasOwnProperty",
                           Builtins::kObjectHasOwnProperty, 1, true);
     SimpleInstallFunction(isolate->initial_object_prototype(),
                           "__lookupGetter__", Builtins::kObjectLookupGetter, 1,
                           true);
     SimpleInstallFunction(isolate->initial_object_prototype(),
                           "__lookupSetter__", Builtins::kObjectLookupSetter, 1,
                           true);
+    SimpleInstallFunction(isolate->initial_object_prototype(), "isPrototypeOf",
+                          Builtins::kObjectPrototypeIsPrototypeOf, 1, true);
     SimpleInstallFunction(
         isolate->initial_object_prototype(), "propertyIsEnumerable",
         Builtins::kObjectPrototypePropertyIsEnumerable, 1, false);
     Handle<JSFunction> object_to_string = SimpleInstallFunction(
         isolate->initial_object_prototype(), factory->toString_string(),
         Builtins::kObjectProtoToString, 0, true);
     native_context()->set_object_to_string(*object_to_string);
     Handle<JSFunction> object_value_of = SimpleInstallFunction(
         isolate->initial_object_prototype(), "valueOf",
         Builtins::kObjectPrototypeValueOf, 0, true);
@@ skipping 4008 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8