Use a dictionary-mode code cache on the map rather than a dual system.

src/types.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 <iomanip>
 
 #include "src/types.h"
 
 #include "src/handles-inl.h"
 #include "src/ostreams.h"
@@ skipping 248 matching lines @@
 #undef FIXED_TYPED_ARRAY_CASE
     case FILLER_TYPE:
     case ACCESS_CHECK_INFO_TYPE:
     case INTERCEPTOR_INFO_TYPE:
     case CALL_HANDLER_INFO_TYPE:
     case FUNCTION_TEMPLATE_INFO_TYPE:
     case OBJECT_TEMPLATE_INFO_TYPE:
     case SIGNATURE_INFO_TYPE:
     case TYPE_SWITCH_INFO_TYPE:
     case ALLOCATION_MEMENTO_TYPE:
-    case CODE_CACHE_TYPE:
-    case POLYMORPHIC_CODE_CACHE_TYPE:
     case TYPE_FEEDBACK_INFO_TYPE:
     case ALIASED_ARGUMENTS_ENTRY_TYPE:
     case BOX_TYPE:
     case DEBUG_INFO_TYPE:
     case BREAK_POINT_INFO_TYPE:
     case CELL_TYPE:
     case WEAK_CELL_TYPE:
     case PROTOTYPE_INFO_TYPE:
     case SLOPPY_BLOCK_WITH_EVAL_CONTEXT_EXTENSION_TYPE:
       UNREACHABLE();
@@ skipping 987 matching lines @@
 #undef CONSTRUCT_SIMD_TYPE
 
 // -----------------------------------------------------------------------------
 // Instantiations.
 
 template class Type::Iterator<i::Map>;
 template class Type::Iterator<i::Object>;
 
 }  // namespace internal
 }  // namespace v8