Avoid exposing compiler-allocated temporaries to the debugger

src/objects.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 4645 matching lines @@
 
   // Return the name of the given context local.
   String* ContextLocalName(int var);
 
   // Return the mode of the given context local.
   VariableMode ContextLocalMode(int var);
 
   // Return the initialization flag of the given context local.
   InitializationFlag ContextLocalInitFlag(int var);
 
+  // Return true if this local was introduced by the compiler, and should not be
+  // exposed to the user in a debugger.
+  bool LocalIsSynthetic(int var);
+
   // Lookup support for serialized scope info. Returns the
   // the stack slot index for a given slot name if the slot is
   // present; otherwise returns a value < 0. The name must be an internalized
   // string.
   int StackSlotIndex(String* name);
 
   // Lookup support for serialized scope info. Returns the
   // context slot index for a given slot name if the slot is present; otherwise
   // returns a value < 0. The name must be an internalized string.
   // If the slot is present and mode != NULL, sets *mode to the corresponding
@@ skipping 6603 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_