[compiler] Support Object.create(null) inlining in TF

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index fa2dcdbfc4fc6b15a97c48e9964bf10a003176b0..589acb7d3aff25ec7fa94475be83c714f172fcc3 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -4724,6 +4724,36 @@ void Map::EnsureDescriptorSlack(Handle<Map> map, int slack) {
   map->UpdateDescriptors(*new_descriptors, layout_descriptor);
 }
 
+// static
+Handle<Map> Map::GetObjectCreateMap(Handle<HeapObject> prototype) {
+  Isolate* isolate = prototype->GetIsolate();
+  Handle<Map> map(isolate->native_context()->object_function()->initial_map(),
+                  isolate);
+  if (map->prototype() == *prototype) return map;
+  if (prototype->IsNull(isolate)) {
+    return isolate->slow_object_with_null_prototype_map();
+  }
+  if (prototype->IsJSObject()) {
+    Handle<JSObject> js_prototype = Handle<JSObject>::cast(prototype);
+    if (!js_prototype->map()->is_prototype_map()) {
+      JSObject::OptimizeAsPrototype(js_prototype, FAST_PROTOTYPE);
+    }
+    Handle<PrototypeInfo> info =
+        Map::GetOrCreatePrototypeInfo(js_prototype, isolate);
+    // TODO(verwaest): Use inobject slack tracking for this map.
+    if (info->HasObjectCreateMap()) {
+      map = handle(info->ObjectCreateMap(), isolate);
+    } else {
+      map = Map::CopyInitialMap(map);
+      Map::SetPrototype(map, prototype, FAST_PROTOTYPE);
+      PrototypeInfo::SetObjectCreateMap(info, map);
+    }
+    return map;
+  }
+
+  return Map::TransitionToPrototype(map, prototype, REGULAR_PROTOTYPE);
+}
+
 template <class T>
 static int AppendUniqueCallbacks(Handle<TemplateList> callbacks,
                                  Handle<typename T::Array> array,
@@ -8226,8 +8256,8 @@ bool Map::OnlyHasSimpleProperties() {
   // Wrapped string elements aren't explicitly stored in the elements backing
   // store, but are loaded indirectly from the underlying string.
   return !IsStringWrapperElementsKind(elements_kind()) &&
-         instance_type() > LAST_SPECIAL_RECEIVER_TYPE &&
-         !has_hidden_prototype() && !is_dictionary_map();
+         !IsSpecialReceiverMap() && !has_hidden_prototype() &&
+         !is_dictionary_map();
 }
 
 MUST_USE_RESULT Maybe<bool> FastGetOwnValuesOrEntries(