[es6] Reintroduce the instanceof operator in the backends.

src/interface-descriptors.cc

 // 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.
 
 #include "src/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
 
 namespace {
@@ skipping 160 matching lines @@
 }
 
 
 void StoreGlobalViaContextDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {SlotRegister(), ValueRegister()};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 
-void InstanceOfDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {LeftRegister(), RightRegister()};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
-
 void StringCompareDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {LeftRegister(), RightRegister()};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 void TypeConversionDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {ArgumentRegister()};
   data->InitializePlatformSpecific(arraysize(registers), registers);
@@ skipping 339 matching lines @@
       Type::Function(AnyTagged(zone), Type::Undefined(), 4, zone)->AsFunction();
   function->InitParameter(kAccumulatorParameter, AnyTagged(zone));
   function->InitParameter(kBytecodeOffsetParameter, UntaggedIntegral32(zone));
   function->InitParameter(kBytecodeArrayParameter, AnyTagged(zone));
   function->InitParameter(kDispatchTableParameter, AnyTagged(zone));
   return function;
 }
 
 }  // namespace internal
 }  // namespace v8