Add bit_field3 to Map objects

src/profile-generator.cc

 // Copyright 2011 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 1847 matching lines @@
       SetInternalReference(obj, entry, 1, cs->first());
       SetInternalReference(obj, entry, 2, cs->second());
     }
   } else if (obj->IsMap()) {
     Map* map = Map::cast(obj);
     SetInternalReference(obj, entry,
                          "prototype", map->prototype(), Map::kPrototypeOffset);
     SetInternalReference(obj, entry,
                          "constructor", map->constructor(),
                          Map::kConstructorOffset);
-    SetInternalReference(obj, entry,
-                         "descriptors", map->instance_descriptors(),
-                         Map::kInstanceDescriptorsOffset);
+    if (!map->instance_descriptors()->IsEmpty()) {
+      SetInternalReference(obj, entry,
+                           "descriptors", map->instance_descriptors(),
+                           Map::kInstanceDescriptorsOrBitField3Offset);
+    }
     SetInternalReference(obj, entry,
                          "code_cache", map->code_cache(),
                          Map::kCodeCacheOffset);
     SetInternalReference(obj, entry, "map", obj->map(), HeapObject::kMapOffset);
     IndexedReferencesExtractor refs_extractor(this, obj, entry);
     obj->Iterate(&refs_extractor);
   } else if (obj->IsSharedFunctionInfo()) {
     SharedFunctionInfo* shared = SharedFunctionInfo::cast(obj);
     SetInternalReference(obj, entry,
                          "name", shared->name(),
@@ skipping 1206 matching lines @@
 
 
 String* GetConstructorNameForHeapProfile(JSObject* object) {
   if (object->IsJSFunction()) return HEAP->closure_symbol();
   return object->constructor_name();
 }
 
 } }  // namespace v8::internal
 
 #endif  // ENABLE_LOGGING_AND_PROFILING