[api] Use shallow copy for the template instantiation cache

src/api-natives.cc

 // Copyright 2015 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/api-natives.h"
 
 #include "src/api.h"
 #include "src/isolate-inl.h"
 #include "src/lookup.h"
 #include "src/messages.h"
@@ skipping 282 matching lines @@
   Handle<JSObject> result;
   uint32_t serial_number =
       static_cast<uint32_t>(Smi::cast(info->serial_number())->value());
   if (serial_number) {
     // Probe cache.
     auto cache = isolate->template_instantiations_cache();
     int entry = cache->FindEntry(serial_number);
     if (entry != UnseededNumberDictionary::kNotFound) {
       Object* boilerplate = cache->ValueAt(entry);
       result = handle(JSObject::cast(boilerplate), isolate);
-      ASSIGN_RETURN_ON_EXCEPTION(
-          isolate, result, JSObject::DeepCopyApiBoilerplate(result), JSObject);
-      return result;
+      return isolate->factory()->CopyJSObject(result);
     }
   }
   // Enter a new scope.  Recursion could otherwise create a lot of handles.
   HandleScope scope(isolate);
   auto constructor = handle(info->constructor(), isolate);
   Handle<JSFunction> cons;
   if (constructor->IsUndefined()) {
     cons = isolate->object_function();
   } else {
     auto cons_templ = Handle<FunctionTemplateInfo>::cast(constructor);
     ASSIGN_RETURN_ON_EXCEPTION(
         isolate, cons, InstantiateFunction(isolate, cons_templ), JSFunction);
   }
   auto object = isolate->factory()->NewJSObject(cons);
   ASSIGN_RETURN_ON_EXCEPTION(
       isolate, result,
       ConfigureInstance(isolate, object, info, is_hidden_prototype),
       JSFunction);
   // TODO(dcarney): is this necessary?
   JSObject::MigrateSlowToFast(result, 0, "ApiNatives::InstantiateObject");
 
   if (serial_number) {
     CacheTemplateInstantiation(isolate, serial_number, result);
-    ASSIGN_RETURN_ON_EXCEPTION(
-        isolate, result, JSObject::DeepCopyApiBoilerplate(result), JSObject);
+    result = isolate->factory()->CopyJSObject(result);
   }
   return scope.CloseAndEscape(result);
 }
 
 
 MaybeHandle<JSFunction> InstantiateFunction(Isolate* isolate,
                                             Handle<FunctionTemplateInfo> data,
                                             Handle<Name> name) {
   uint32_t serial_number =
       static_cast<uint32_t>(Smi::cast(data->serial_number())->value());
@@ skipping 280 matching lines @@
     map->set_is_callable();
     map->set_is_constructor(true);
   }
 
   DCHECK(result->shared()->IsApiFunction());
   return result;
 }
 
 }  // namespace internal
 }  // namespace v8