Remove special frontend for callbacks with slow-mode holders.

src/ic.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/accessors.h"
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/codegen.h"
@@ skipping 983 matching lines @@
 
     Handle<Object> accessors = lookup->GetAccessors();
     if (accessors->IsExecutableAccessorInfo()) {
       Handle<ExecutableAccessorInfo> info =
           Handle<ExecutableAccessorInfo>::cast(accessors);
       if (v8::ToCData<Address>(info->getter()) == 0) return slow_stub();
       if (!ExecutableAccessorInfo::IsCompatibleReceiverType(isolate(), info,
                                                             type)) {
         return slow_stub();
       }
-      if (holder->IsGlobalObject()) return slow_stub();
+      if (!holder->HasFastProperties()) return slow_stub();
       return compiler.CompileLoadCallback(name, info);
     }
     if (accessors->IsAccessorPair()) {
       Handle<Object> getter(Handle<AccessorPair>::cast(accessors)->getter(),
                             isolate());
       if (!getter->IsJSFunction()) return slow_stub();
-      if (holder->IsGlobalObject()) return slow_stub();
       if (!holder->HasFastProperties()) return slow_stub();
       Handle<JSFunction> function = Handle<JSFunction>::cast(getter);
       if (!object->IsJSObject() && !function->IsBuiltin() &&
           function->shared()->strict_mode() == SLOPPY) {
         // Calling sloppy non-builtins with a value as the receiver
         // requires boxing.
         return slow_stub();
       }
       CallOptimization call_optimization(function);
       if (call_optimization.is_simple_api_call() &&
@@ skipping 2039 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal