Revert "Implement simple effect typing for variables" and "Handle switch effects".

src/zone-inl.h

 // Copyright 2012 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 91 matching lines @@
   return zone_->New(static_cast<int>(size));
 }
 
 
 template <typename T>
 void* ZoneList<T>::operator new(size_t size, Zone* zone) {
   return zone->New(static_cast<int>(size));
 }
 
 
-template <typename T>
-void* ZoneSplayTree<T>::operator new(size_t size, Zone* zone) {
-  return zone->New(static_cast<int>(size));
-}
-
-
 } }  // namespace v8::internal
 
 #endif  // V8_ZONE_INL_H_