Remove variable rewrites and the unneccesary Slot class.

src/scopes.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 421 matching lines @@
   void AllocateNonParameterLocals();
   void AllocateVariablesRecursively();
 
  private:
   // Construct a function or block scope based on the scope info.
   Scope(Scope* inner_scope, Type type, Handle<SerializedScopeInfo> scope_info);
 
   // Construct a catch scope with a binding for the name.
   Scope(Scope* inner_scope, Handle<String> catch_variable_name);
 
-  inline Slot* NewSlot(Variable* var, Slot::Type type, int index) {
-    return new(isolate_->zone()) Slot(isolate_, var, type, index);
-  }
-
   void AddInnerScope(Scope* inner_scope) {
     if (inner_scope != NULL) {
       inner_scopes_.Add(inner_scope);
       inner_scope->outer_scope_ = this;
     }
   }
 
   void SetDefaults(Type type,
                    Scope* outer_scope,
                    Handle<SerializedScopeInfo> scope_info);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPES_H_