Reduce number of deopts caused by ForceDelete.

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 539 matching lines @@
         Handle<Map> new_map = Map::CopyDropDescriptors(handle(object->map()));
         DCHECK(new_map->is_dictionary_map());
 #if TRACE_MAPS
         if (FLAG_trace_maps) {
           PrintF("[TraceMaps: GlobalDeleteNormalized from= %p to= %p ]\n",
                  reinterpret_cast<void*>(object->map()),
                  reinterpret_cast<void*>(*new_map));
         }
 #endif
         JSObject::MigrateToMap(object, new_map);
+        // Optimized code does not check for the hole value for non-configurable
+        // properties.
+        Deoptimizer::DeoptimizeGlobalObject(*object);
       }
       Handle<PropertyCell> cell(PropertyCell::cast(dictionary->ValueAt(entry)));
       Handle<Object> value = isolate->factory()->the_hole_value();
       PropertyCell::SetValueInferType(cell, value);
       dictionary->DetailsAtPut(entry, details.AsDeleted());
     } else {
       Handle<Object> deleted(
           NameDictionary::DeleteProperty(dictionary, entry, mode));
       if (*deleted == isolate->heap()->true_value()) {
         Handle<NameDictionary> new_properties =
@@ skipping 16256 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