Always show link to prototype transitions in heap snapshot.

src/profile-generator.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2065 matching lines @@
                          "prototype", map->prototype(), Map::kPrototypeOffset);
     SetInternalReference(obj, entry,
                          "constructor", map->constructor(),
                          Map::kConstructorOffset);
     if (!map->instance_descriptors()->IsEmpty()) {
       TagObject(map->instance_descriptors(), "(map descriptors)");
       SetInternalReference(obj, entry,
                            "descriptors", map->instance_descriptors(),
                            Map::kInstanceDescriptorsOrBitField3Offset);
     }
-    if (map->prototype_transitions() != heap_->empty_fixed_array()) {
-      TagObject(map->prototype_transitions(), "(prototype transitions)");
-      SetInternalReference(obj,
-                           entry,
-                           "prototype_transitions",
-                           map->prototype_transitions(),
-                           Map::kPrototypeTransitionsOffset);
-    }
+    TagObject(map->prototype_transitions(), "(prototype transitions)");
+    SetInternalReference(obj, entry,
+                         "prototype_transitions", map->prototype_transitions(),
+                         Map::kPrototypeTransitionsOffset);
     SetInternalReference(obj, entry,
                          "code_cache", map->code_cache(),
                          Map::kCodeCacheOffset);
   } else if (obj->IsSharedFunctionInfo()) {
     SharedFunctionInfo* shared = SharedFunctionInfo::cast(obj);
     SetInternalReference(obj, entry,
                          "name", shared->name(),
                          SharedFunctionInfo::kNameOffset);
     SetInternalReference(obj, entry,
                          "code", shared->unchecked_code(),
@@ skipping 1799 matching lines @@
 
 
 void HeapSnapshotJSONSerializer::SortHashMap(
     HashMap* map, List<HashMap::Entry*>* sorted_entries) {
   for (HashMap::Entry* p = map->Start(); p != NULL; p = map->Next(p))
     sorted_entries->Add(p);
   sorted_entries->Sort(SortUsingEntryValue);
 }
 
 } }  // namespace v8::internal