[api] Introduce fast instantiations cache

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index dfe8bd6cf1b28a22a325e814be378c937f44e07a..775ccbd4cec01e72065fb4467790b222d0d734e7 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -2317,17 +2317,17 @@ Handle<Object> FixedArray::get(FixedArray* array, int index, Isolate* isolate) {
 }
 
 template <class T>
-MaybeHandle<T> FixedArray::GetValue(int index) const {
+MaybeHandle<T> FixedArray::GetValue(Isolate* isolate, int index) const {
   Object* obj = get(index);
-  if (obj->IsUndefined(GetIsolate())) return MaybeHandle<T>();
-  return Handle<T>(T::cast(obj));
+  if (obj->IsUndefined(isolate)) return MaybeHandle<T>();
+  return Handle<T>(T::cast(obj), isolate);
 }
 
 template <class T>
-Handle<T> FixedArray::GetValueChecked(int index) const {
+Handle<T> FixedArray::GetValueChecked(Isolate* isolate, int index) const {
   Object* obj = get(index);
-  CHECK(!obj->IsUndefined(GetIsolate()));
-  return Handle<T>(T::cast(obj));
+  CHECK(!obj->IsUndefined(isolate));
+  return Handle<T>(T::cast(obj), isolate);
 }
 
 bool FixedArray::is_the_hole(int index) {
@@ -5601,6 +5601,27 @@ bool FunctionTemplateInfo::instantiated() {
   return shared_function_info()->IsSharedFunctionInfo();
 }
 
+FunctionTemplateInfo* FunctionTemplateInfo::GetParent(Isolate* isolate) {
+  Object* parent = parent_template();
+  return parent->IsUndefined(isolate) ? nullptr
+                                      : FunctionTemplateInfo::cast(parent);
+}
+
+ObjectTemplateInfo* ObjectTemplateInfo::GetParent(Isolate* isolate) {
+  Object* maybe_ctor = constructor();
+  if (maybe_ctor->IsUndefined(isolate)) return nullptr;
+  FunctionTemplateInfo* constructor = FunctionTemplateInfo::cast(maybe_ctor);
+  while (true) {
+    constructor = constructor->GetParent(isolate);
+    if (constructor == nullptr) return nullptr;
+    Object* maybe_obj = constructor->instance_template();
+    if (!maybe_obj->IsUndefined(isolate)) {
+      return ObjectTemplateInfo::cast(maybe_obj);
+    }
+  }
+  return nullptr;
+}
+
 ACCESSORS(PrototypeInfo, prototype_users, Object, kPrototypeUsersOffset)
 ACCESSORS(PrototypeInfo, object_create_map, Object, kObjectCreateMap)
 SMI_ACCESSORS(PrototypeInfo, registry_slot, kRegistrySlotOffset)