[runtime] Add PropertyConstness bit to PropertyDetails.

src/property.h

 // 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.
 
 #ifndef V8_PROPERTY_H_
 #define V8_PROPERTY_H_
 
 #include <iosfwd>
 
 #include "src/factory.h"
@@ skipping 15 matching lines @@
   Handle<Object> GetValue() const { return value_; }
   PropertyDetails GetDetails() const { return details_; }
 
   void SetSortedKeyIndex(int index) { details_ = details_.set_pointer(index); }
 
   static Descriptor DataField(Handle<Name> key, int field_index,
                               PropertyAttributes attributes,
                               Representation representation);
 
   static Descriptor DataField(Handle<Name> key, int field_index,
-                              Handle<Object> wrapped_field_type,
                               PropertyAttributes attributes,
-                              Representation representation) {
-    DCHECK(wrapped_field_type->IsSmi() || wrapped_field_type->IsWeakCell());
-    return Descriptor(key, wrapped_field_type, kData, attributes, kField,
-                      representation, field_index);
-  }
+                              PropertyConstness constness,
+                              Representation representation,
+                              Handle<Object> wrapped_field_type);
 
   static Descriptor DataConstant(Handle<Name> key, Handle<Object> value,
                                  PropertyAttributes attributes) {
-    return Descriptor(key, value, kData, attributes, kDescriptor,
-                      value->OptimalRepresentation());
+    return Descriptor(key, value, kData, attributes, kDescriptor, kConst,
+                      value->OptimalRepresentation(), 0);
   }
 
   static Descriptor AccessorConstant(Handle<Name> key, Handle<Object> foreign,
                                      PropertyAttributes attributes) {
-    return Descriptor(key, foreign, kAccessor, attributes, kDescriptor,
-                      Representation::Tagged());
+    return Descriptor(key, foreign, kAccessor, attributes, kDescriptor, kConst,
+                      Representation::Tagged(), 0);
   }
 
  private:
   Handle<Name> key_;
   Handle<Object> value_;
   PropertyDetails details_;
 
  protected:
   void Init(Handle<Name> key, Handle<Object> value, PropertyDetails details) {
     DCHECK(key->IsUniqueName());
     DCHECK_IMPLIES(key->IsPrivate(), !details.IsEnumerable());
     key_ = key;
     value_ = value;
     details_ = details;
   }
 
   Descriptor(Handle<Name> key, Handle<Object> value, PropertyDetails details)
       : key_(key), value_(value), details_(details) {
     DCHECK(key->IsUniqueName());
     DCHECK_IMPLIES(key->IsPrivate(), !details_.IsEnumerable());
   }
 
   Descriptor(Handle<Name> key, Handle<Object> value, PropertyKind kind,
              PropertyAttributes attributes, PropertyLocation location,
-             Representation representation, int field_index = 0)
+             PropertyConstness constness, Representation representation,
+             int field_index)
       : key_(key),
         value_(value),
-        details_(kind, attributes, location, representation, field_index) {
+        details_(kind, attributes, location, constness, representation,
+                 field_index) {
     DCHECK(key->IsUniqueName());
     DCHECK_IMPLIES(key->IsPrivate(), !details_.IsEnumerable());
   }
 
   friend class DescriptorArray;
   friend class Map;
   friend class MapUpdater;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PROPERTY_H_