Clean up hash creation code to use Handle<Smi> where possible

src/api.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 "api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #include <cmath>  // For isnan.
 #include "../include/v8-debug.h"
 #include "../include/v8-profiler.h"
@@ skipping 3566 matching lines @@
   return Utils::ToLocal(i::Handle<i::Context>(context));
 }
 
 
 int v8::Object::GetIdentityHash() {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::GetIdentityHash()", return 0);
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
-  return i::Handle<i::Smi>::cast(
-      i::JSReceiver::GetOrCreateIdentityHash(self))->value();
+  return i::JSReceiver::GetOrCreateIdentityHash(self)->value();
 }
 
 
 bool v8::Object::SetHiddenValue(v8::Handle<v8::String> key,
                                 v8::Handle<v8::Value> value) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::SetHiddenValue()", return false);
   if (value.IsEmpty()) return DeleteHiddenValue(key);
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
@@ skipping 3995 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal