Updated the check for unmodfied objects to handle Smi Objects.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 1105c6868dc4699e0c0ffb9c057d7a6c16775112..0bb12f6b6af42d0f68ff8f9a88a84c8a7d86498d 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1493,12 +1493,13 @@ static bool IsUnscavengedHeapObject(Heap* heap, Object** p) {
 
 static bool IsUnmodifiedHeapObject(Object** p) {
   Object* object = *p;
-  DCHECK(object->IsHeapObject());
+  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;