Reland parts of 'Use weak cells in map checks in polymorphic ICs'

src/factory.cc

 // Copyright 2014 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 "src/factory.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/conversions.h"
 #include "src/isolate-inl.h"
@@ skipping 784 matching lines @@
       isolate()->heap()->AllocateStruct(type),
       Struct);
 }
 
 
 Handle<CodeCache> Factory::NewCodeCache() {
   Handle<CodeCache> code_cache =
       Handle<CodeCache>::cast(NewStruct(CODE_CACHE_TYPE));
   code_cache->set_default_cache(*empty_fixed_array(), SKIP_WRITE_BARRIER);
   code_cache->set_normal_type_cache(*undefined_value(), SKIP_WRITE_BARRIER);
+  code_cache->set_weak_cell_cache(*undefined_value(), SKIP_WRITE_BARRIER);
   return code_cache;
 }
 
 
 Handle<AliasedArgumentsEntry> Factory::NewAliasedArgumentsEntry(
     int aliased_context_slot) {
   Handle<AliasedArgumentsEntry> entry = Handle<AliasedArgumentsEntry>::cast(
       NewStruct(ALIASED_ARGUMENTS_ENTRY_TYPE));
   entry->set_aliased_context_slot(aliased_context_slot);
   return entry;
@@ skipping 1705 matching lines @@
   return Handle<Object>::null();
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 } }  // namespace v8::internal