Don't wrap roots in Handle just to dereference immediately.

src/snapshot/code-serializer.cc

Index: src/snapshot/code-serializer.cc
diff --git a/src/snapshot/code-serializer.cc b/src/snapshot/code-serializer.cc
index 7e1e545759ce021d2062bbcf04df85a4ede0c252..1481eb6a30b69e71e738a967494b7bcc66fb43ad 100644
--- a/src/snapshot/code-serializer.cc
+++ b/src/snapshot/code-serializer.cc
@@ -100,8 +100,8 @@ void CodeSerializer::SerializeObject(HeapObject* obj, HowToCode how_to_code,
   }
 
   if (ElideObject(obj)) {
-    return SerializeObject(*isolate()->factory()->undefined_value(),
-                           how_to_code, where_to_point, skip);
+    return SerializeObject(isolate()->heap()->undefined_value(), how_to_code,
+                           where_to_point, skip);
   }
   // Past this point we should not see any (context-specific) maps anymore.
   CHECK(!obj->IsMap());