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

src/ic/handler-compiler.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/ic/handler-compiler.h"
 
 #include "src/field-type.h"
 #include "src/ic/call-optimization.h"
 #include "src/ic/handler-configuration-inl.h"
 #include "src/ic/ic-inl.h"
 #include "src/ic/ic.h"
 #include "src/isolate-inl.h"
 
 namespace v8 {
 namespace internal {
 
 Handle<Code> PropertyHandlerCompiler::Find(Handle<Name> name,
                                            Handle<Map> stub_holder,
                                            Code::Kind kind,
                                            CacheHolderFlag cache_holder) {
+  // TODO(ishell): Experiment: don't cache handlers in map-specific code cache.
+  return Handle<Code>();
+
   Code::Flags flags = Code::ComputeHandlerFlags(kind, cache_holder);
   Code* code = stub_holder->LookupInCodeCache(*name, flags);
   if (code == nullptr) return Handle<Code>();
   return handle(code);
 }
 
 
 Handle<Code> NamedLoadHandlerCompiler::ComputeLoadNonexistent(
     Handle<Name> name, Handle<Map> receiver_map) {
   Isolate* isolate = name->GetIsolate();
@@ skipping 613 matching lines @@
 }
 
 void ElementHandlerCompiler::CompileElementHandlers(
     MapHandleList* receiver_maps, List<Handle<Object>>* handlers) {
   for (int i = 0; i < receiver_maps->length(); ++i) {
     handlers->Add(GetKeyedLoadHandler(receiver_maps->at(i), isolate()));
   }
 }
 }  // namespace internal
 }  // namespace v8