Reimplement SetProperty using the LookupIterator

src/ic.cc

Index: src/ic.cc
diff --git a/src/ic.cc b/src/ic.cc
index 7fee8b57ed42a8513921935457bfd6cc8b7fa559..f3df1d0f2022a6a146de07c19059f2ce8e28acac 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -1280,6 +1280,8 @@ MaybeHandle<Object> StoreIC::Store(Handle<Object> object,
                                    Handle<String> name,
                                    Handle<Object> value,
                                    JSReceiver::StoreFromKeyed store_mode) {
+  // TODO(verwaest): Let SetProperty do the migration, since storing a property
+  // might deprecate the current map again, if value does not fit.
   if (MigrateDeprecated(object) || object->IsJSProxy()) {
     Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(object);
     Handle<Object> result;
@@ -1753,6 +1755,8 @@ KeyedAccessStoreMode KeyedStoreIC::GetStoreMode(Handle<JSObject> receiver,
 MaybeHandle<Object> KeyedStoreIC::Store(Handle<Object> object,
                                         Handle<Object> key,
                                         Handle<Object> value) {
+  // TODO(verwaest): Let SetProperty do the migration, since storing a property
+  // might deprecate the current map again, if value does not fit.
   if (MigrateDeprecated(object)) {
     Handle<Object> result;
     ASSIGN_RETURN_ON_EXCEPTION(