Fix bit field for GlobalHandles::Node State in MSVC.

src/global-handles.cc

 // Copyright 2009 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 192 matching lines @@
 
   // Transition diagram:
   // NORMAL <-> WEAK -> PENDING -> NEAR_DEATH -> { NORMAL, WEAK, DESTROYED }
   enum State {
     NORMAL,      // Normal global handle.
     WEAK,        // Flagged as weak but not yet finalized.
     PENDING,     // Has been recognized as only reachable by weak handles.
     NEAR_DEATH,  // Callback has informed the handle is near death.
     DESTROYED
   };
-  State state_;
+  State state_ : 4;  // Need one more bit for MSVC as it treats enums as signed.
 
  private:
   // Handle specific callback.
   WeakReferenceCallback callback_;
   // Provided data for callback.  In DESTROYED state, this is used for
   // the free list link.
   union {
     void* parameter;
     Node* next_free;
   } parameter_or_next_free_;
@@ skipping 329 matching lines @@
 
 void GlobalHandles::RemoveObjectGroups() {
   List<ObjectGroup*>* object_groups = ObjectGroups();
   for (int i = 0; i< object_groups->length(); i++) {
     delete object_groups->at(i);
   }
   object_groups->Clear();
 }
 
 } }  // namespace v8::internal