Basic support for tracking smi-only arrays on ia32.

src/factory.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 185 matching lines @@
 
   Handle<ExternalArray> NewExternalArray(
       int length,
       ExternalArrayType array_type,
       void* external_pointer,
       PretenureFlag pretenure = NOT_TENURED);
 
   Handle<JSGlobalPropertyCell> NewJSGlobalPropertyCell(
       Handle<Object> value);
 
-  Handle<Map> NewMap(InstanceType type, int instance_size);
+  Handle<Map> NewMap(InstanceType type,
+                     int instance_size,
+                     ElementsKind elements_kind = FAST_ELEMENTS);
 
   Handle<JSObject> NewFunctionPrototype(Handle<JSFunction> function);
 
   Handle<Map> CopyMapDropDescriptors(Handle<Map> map);
 
   // Copy the map adding more inobject properties if possible without
   // overflowing the instance size.
   Handle<Map> CopyMap(Handle<Map> map, int extra_inobject_props);
 
   Handle<Map> CopyMapDropTransitions(Handle<Map> map);
@@ skipping 29 matching lines @@
   Handle<JSObject> NewJSObjectFromMap(Handle<Map> map);
 
   // JS arrays are pretenured when allocated by the parser.
   Handle<JSArray> NewJSArray(int capacity,
                              PretenureFlag pretenure = NOT_TENURED);
 
   Handle<JSArray> NewJSArrayWithElements(
       Handle<FixedArray> elements,
       PretenureFlag pretenure = NOT_TENURED);
 
+  void SetContent(Handle<JSArray> array, Handle<FixedArray> elements);
+
+  void EnsureCanContainNonSmiElements(Handle<JSArray> array);
+
   Handle<JSProxy> NewJSProxy(Handle<Object> handler, Handle<Object> prototype);
 
   // Change the type of the argument into a JS object/function and reinitialize.
   void BecomeJSObject(Handle<JSReceiver> object);
   void BecomeJSFunction(Handle<JSReceiver> object);
 
   Handle<JSFunction> NewFunction(Handle<String> name,
                                  Handle<Object> prototype);
 
   Handle<JSFunction> NewFunctionWithoutPrototype(
@@ skipping 192 matching lines @@
   // Update the map cache in the global context with (keys, map)
   Handle<MapCache> AddToMapCache(Handle<Context> context,
                                  Handle<FixedArray> keys,
                                  Handle<Map> map);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FACTORY_H_