Use the LookupIterator for SetElement and friends

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 39646cd4b5e47cc2419c9fbb0a556c209dcc1440..27528d644253793d8418fc019ec183557cd52c31 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1197,17 +1197,6 @@ MaybeHandle<Object> Object::GetProperty(Isolate* isolate,
 }
 
 
-MaybeHandle<Object> JSProxy::SetElementWithHandler(Handle<JSProxy> proxy,
-                                                   Handle<JSReceiver> receiver,
-                                                   uint32_t index,
-                                                   Handle<Object> value,
-                                                   LanguageMode language_mode) {
-  Isolate* isolate = proxy->GetIsolate();
-  Handle<String> name = isolate->factory()->Uint32ToString(index);
-  return SetPropertyWithHandler(proxy, receiver, name, value, language_mode);
-}
-
-
 #define FIELD_ADDR(p, offset) \
   (reinterpret_cast<byte*>(p) + offset - kHeapObjectTag)
 
@@ -2216,14 +2205,6 @@ bool JSObject::HasFastProperties() {
 }
 
 
-MaybeHandle<Object> JSObject::SetOwnElement(Handle<JSObject> object,
-                                            uint32_t index,
-                                            Handle<Object> value,
-                                            LanguageMode language_mode) {
-  return JSObject::SetOwnElement(object, index, value, NONE, language_mode);
-}
-
-
 bool Map::TooManyFastProperties(StoreFromKeyed store_mode) {
   if (unused_property_fields() != 0) return false;
   if (is_prototype_map()) return false;
@@ -6776,15 +6757,6 @@ bool AccessorInfo::IsCompatibleReceiver(Object* receiver) {
 }
 
 
-// static
-void ExecutableAccessorInfo::ClearSetter(Handle<ExecutableAccessorInfo> info) {
-  auto foreign = info->GetIsolate()->factory()->NewForeign(
-      reinterpret_cast<v8::internal::Address>(
-          reinterpret_cast<intptr_t>(nullptr)));
-  info->set_setter(*foreign);
-}
-
-
 template<typename Derived, typename Shape, typename Key>
 void Dictionary<Derived, Shape, Key>::SetEntry(int entry,
                                                Handle<Object> key,