[turbofan] Set proper representation for initial arguments length.

src/bootstrapper.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/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/ieee754.h"
 #include "src/code-stubs.h"
@@ skipping 3011 matching lines @@
     function->shared()->set_instance_class_name(*arguments_string);
 
     Handle<Map> map = factory->NewMap(
         JS_ARGUMENTS_TYPE, JSSloppyArgumentsObject::kSize, FAST_ELEMENTS);
     // Create the descriptor array for the arguments object.
     Map::EnsureDescriptorSlack(map, 2);
 
     {  // length
       Descriptor d = Descriptor::DataField(
           factory->length_string(), JSSloppyArgumentsObject::kLengthIndex,
-          DONT_ENUM, Representation::Tagged());
+          DONT_ENUM, Representation::Smi());
       map->AppendDescriptor(&d);
     }
     {  // callee
       Descriptor d = Descriptor::DataField(
           factory->callee_string(), JSSloppyArgumentsObject::kCalleeIndex,
-          DONT_ENUM, Representation::Tagged());
+          DONT_ENUM, Representation::HeapObject());
       map->AppendDescriptor(&d);
     }
     // @@iterator method is added later.
 
     map->SetInObjectProperties(2);
     native_context()->set_sloppy_arguments_map(*map);
 
     DCHECK(!function->has_initial_map());
     JSFunction::SetInitialMap(function, map,
                               isolate->initial_object_prototype());
@@ skipping 30 matching lines @@
 
     // Create the map. Allocate one in-object field for length.
     Handle<Map> map = factory->NewMap(
         JS_ARGUMENTS_TYPE, JSStrictArgumentsObject::kSize, FAST_ELEMENTS);
     // Create the descriptor array for the arguments object.
     Map::EnsureDescriptorSlack(map, 2);
 
     {  // length
       Descriptor d = Descriptor::DataField(
           factory->length_string(), JSStrictArgumentsObject::kLengthIndex,
-          DONT_ENUM, Representation::Tagged());
+          DONT_ENUM, Representation::Smi());
       map->AppendDescriptor(&d);
     }
     {  // callee
       Descriptor d = Descriptor::AccessorConstant(factory->callee_string(),
                                                   callee, attributes);
       map->AppendDescriptor(&d);
     }
     // @@iterator method is added later.
 
     DCHECK_EQ(native_context()->object_function()->prototype(),
@@ skipping 2152 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8