Remove map-copying for global objects. This was an old (broken) requirement that has been fixed for…

src/objects.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <iomanip>
 #include <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 7254 matching lines @@
 
 
 Handle<Map> Map::TransitionToAccessorProperty(Handle<Map> map,
                                               Handle<Name> name,
                                               AccessorComponent component,
                                               Handle<Object> accessor,
                                               PropertyAttributes attributes) {
   Isolate* isolate = name->GetIsolate();
 
   // Dictionary maps can always have additional data properties.
-  if (map->is_dictionary_map()) {
-    // For global objects, property cells are inlined. We need to change the
-    // map.
-    if (map->IsGlobalObjectMap()) return Copy(map, "GlobalAccessor");
-    return map;
-  }
+  if (map->is_dictionary_map()) return map;
 
   // Migrate to the newest map before transitioning to the new property.
   map = Update(map);
 
   PropertyNormalizationMode mode = map->is_prototype_map()
                                        ? KEEP_INOBJECT_PROPERTIES
                                        : CLEAR_INOBJECT_PROPERTIES;
 
   Map* maybe_transition =
       TransitionArray::SearchTransition(*map, kAccessor, *name, attributes);
@@ skipping 8829 matching lines @@
                                             Handle<Object> new_value) {
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 }  // namespace internal
 }  // namespace v8