Use EmbedderHeapTracer instead of object grouping when trace_embedder_heap flag is set

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 506a723796a7da2737030661e9137fde9398d7ef..a46e5dd0bd33f45f619339b2952fe6919b331d31 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1557,15 +1557,12 @@ static bool IsUnmodifiedHeapObject(Object** p) {
   if (object->IsSmi()) return false;
   HeapObject* heap_object = HeapObject::cast(object);
   if (!object->IsJSObject()) return false;
-  Object* obj_constructor = (JSObject::cast(object))->map()->GetConstructor();
-  if (!obj_constructor->IsJSFunction()) return false;
-  JSFunction* constructor = JSFunction::cast(obj_constructor);
-  if (!constructor->shared()->IsApiFunction()) return false;
-  if (constructor != nullptr &&
-      constructor->initial_map() == heap_object->map()) {
-    return true;
-  }
-  return false;
+  JSObject* js_object = JSObject::cast(object);
+  if (!js_object->WasConstructedFromApiFunction()) return false;
+  JSFunction* constructor =
+      JSFunction::cast(js_object->map()->GetConstructor());
+
+  return constructor->initial_map() == heap_object->map();
 }