[turbofan] Properly optimize instanceof (even in the presence of @@hasInstance).

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 1239 matching lines @@
                           Builtins::kFunctionPrototypeCall, 1, false);
     SimpleInstallFunction(prototype, factory->toString_string(),
                           Builtins::kFunctionPrototypeToString, 0, false);
 
     // Install the @@hasInstance function.
     Handle<JSFunction> has_instance = InstallFunction(
         prototype, factory->has_instance_symbol(), JS_OBJECT_TYPE,
         JSObject::kHeaderSize, MaybeHandle<JSObject>(),
         Builtins::kFunctionPrototypeHasInstance,
         static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY));
+    has_instance->shared()->set_builtin_function_id(kFunctionHasInstance);
     native_context()->set_function_has_instance(*has_instance);
 
     // Set the expected parameters for @@hasInstance to 1; required by builtin.
     has_instance->shared()->set_internal_formal_parameter_count(1);
 
     // Set the length for the function to satisfy ECMA-262.
     has_instance->shared()->set_length(1);
 
     // Install the "constructor" property on the %FunctionPrototype%.
     JSObject::AddProperty(prototype, factory->constructor_string(),
@@ skipping 3296 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8