Add a native data property that replaces itself with a real data property

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index fb594fd2d6c9102de48f3da44c002958dd19ba5b..5160ca93721ade351402085331809b7faa39ca97 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -1352,8 +1352,14 @@ MaybeHandle<Object> Object::GetPropertyWithAccessor(LookupIterator* it) {
     Handle<Object> result = args.Call(call_fun, name);
     RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
     if (result.is_null()) return isolate->factory()->undefined_value();
-    // Rebox handle before return.
-    return handle(*result, isolate);
+    Handle<Object> reboxed_result = handle(*result, isolate);
+    if (info->replace_on_access() && receiver->IsJSReceiver()) {
+      args.Call(reinterpret_cast<GenericNamedPropertySetterCallback>(
+                    &Accessors::ReconfigureToDataProperty),
+                name, result);
+      RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
+    }
+    return reboxed_result;
   }
 
   // Regular accessor.