Remove unused byte from Map::instance_sizes field.

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 6724 matching lines @@
 }
 
 
 Handle<Map> Map::CopyDropDescriptors(Handle<Map> map) {
   Handle<Map> result = RawCopy(map, map->instance_size());
 
   // Please note instance_type and instance_size are set when allocated.
   result->set_inobject_properties(map->inobject_properties());
   result->set_unused_property_fields(map->unused_property_fields());
 
-  result->set_pre_allocated_property_fields(
-      map->pre_allocated_property_fields());
   result->ClearCodeCache(map->GetHeap());
   map->NotifyLeafMapLayoutChange();
   return result;
 }
 
 
 Handle<Map> Map::ShareDescriptor(Handle<Map> map,
                                  Handle<DescriptorArray> descriptors,
                                  Descriptor* descriptor) {
   // Sanity check. This path is only to be taken if the map owns its descriptor
@@ skipping 9375 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