Only create arguments-maps in the bootstrapper, remove now obsolete ValueType flag.

src/builtins.cc

 // Copyright 2012 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/v8.h"
 
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/base/once.h"
 #include "src/bootstrapper.h"
@@ skipping 625 matching lines @@
 
       if (!array->HasFastElements()) {
         AllowHeapAllocation allow_allocation;
         return CallJsBuiltin(isolate, "ArraySlice", args);
       }
 
       len = Smi::cast(array->length())->value();
     } else {
       // Array.slice(arguments, ...) is quite a common idiom (notably more
       // than 50% of invocations in Web apps).  Treat it in C++ as well.
-      Map* arguments_map = isolate->context()->native_context()->
-          sloppy_arguments_boilerplate()->map();
+      Map* arguments_map =
+          isolate->context()->native_context()->sloppy_arguments_map();
 
       bool is_arguments_object_with_fast_elements =
           receiver->IsJSObject() &&
           JSObject::cast(*receiver)->map() == arguments_map;
       if (!is_arguments_object_with_fast_elements) {
         AllowHeapAllocation allow_allocation;
         return CallJsBuiltin(isolate, "ArraySlice", args);
       }
       JSObject* object = JSObject::cast(*receiver);
 
@@ skipping 1054 matching lines @@
 }
 BUILTIN_LIST_C(DEFINE_BUILTIN_ACCESSOR_C)
 BUILTIN_LIST_A(DEFINE_BUILTIN_ACCESSOR_A)
 BUILTIN_LIST_H(DEFINE_BUILTIN_ACCESSOR_H)
 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
 #undef DEFINE_BUILTIN_ACCESSOR_C
 #undef DEFINE_BUILTIN_ACCESSOR_A
 
 
 } }  // namespace v8::internal