Reland "Avoid some unnecessary fast-properties map creations."

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 <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
@@ skipping 9487 matching lines @@
 
 void JSObject::OptimizeAsPrototype(Handle<JSObject> object,
                                    PrototypeOptimizationMode mode) {
   if (object->IsGlobalObject()) return;
   if (object->IsJSGlobalProxy()) return;
   if (mode == FAST_PROTOTYPE && !object->map()->is_prototype_map()) {
     // First normalize to ensure all JSFunctions are CONSTANT.
     JSObject::NormalizeProperties(object, KEEP_INOBJECT_PROPERTIES, 0,
                                   "NormalizeAsPrototype");
   }
+  bool has_just_copied_map = false;
   if (!object->HasFastProperties()) {
     JSObject::MigrateSlowToFast(object, 0, "OptimizeAsPrototype");
+    has_just_copied_map = true;
   }
   if (mode == FAST_PROTOTYPE && object->HasFastProperties() &&
       !object->map()->is_prototype_map()) {
-    Handle<Map> new_map = Map::Copy(handle(object->map()), "CopyAsPrototype");
-    JSObject::MigrateToMap(object, new_map);
+    if (!has_just_copied_map) {
+      Handle<Map> new_map = Map::Copy(handle(object->map()), "CopyAsPrototype");
+      JSObject::MigrateToMap(object, new_map);
+    }
     object->map()->set_is_prototype_map(true);
   }
 }
 
 
 void JSObject::ReoptimizeIfPrototype(Handle<JSObject> object) {
   if (!object->map()->is_prototype_map()) return;
   OptimizeAsPrototype(object, FAST_PROTOTYPE);
 }
 
@@ skipping 7139 matching lines @@
   Handle<DependentCode> codes =
       DependentCode::Insert(handle(cell->dependent_code(), info->isolate()),
                             DependentCode::kPropertyCellChangedGroup,
                             info->object_wrapper());
   if (*codes != cell->dependent_code()) cell->set_dependent_code(*codes);
   info->dependencies(DependentCode::kPropertyCellChangedGroup)->Add(
       cell, info->zone());
 }
 
 } }  // namespace v8::internal