Revert of [ic] Experiment: disable map-specific handler cache.

src/objects.cc

 // Copyright 2015 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <memory>
 #include <sstream>
@@ skipping 9974 matching lines @@
 
   static inline int GetLinearUsage(FixedArray* linear_cache) {
     DCHECK_GT(linear_cache->length(), kEntrySize);
     return Smi::cast(linear_cache->get(kLinearUsageIndex))->value();
   }
 };
 
 void Map::UpdateCodeCache(Handle<Map> map,
                           Handle<Name> name,
                           Handle<Code> code) {
-  // TODO(ishell): Experiment: don't cache handlers in map-specific code cache.
-  return;
   Isolate* isolate = map->GetIsolate();
   Handle<FixedArray> cache(map->code_cache(), isolate);
   Handle<FixedArray> new_cache = CodeCache::Put(isolate, cache, name, code);
   map->set_code_cache(*new_cache);
 }
 
 Code* Map::LookupInCodeCache(Name* name, Code::Flags flags) {
   return CodeCache::Lookup(code_cache(), name, flags);
 }
 
@@ skipping 10257 matching lines @@
         ns, Accessors::ModuleNamespaceEntryInfo(isolate, name, attr))
         .Check();
   }
   JSObject::PreventExtensions(ns, THROW_ON_ERROR).ToChecked();
 
   return ns;
 }
 
 }  // namespace internal
 }  // namespace v8