Provide private symbols through internal APIs

src/objects-printer.cc

 // 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 505 matching lines @@
   UNREACHABLE();
   return "UNKNOWN";  // Keep the compiler happy.
 }
 
 
 void Symbol::SymbolPrint(FILE* out) {
   HeapObject::PrintHeader(out, "Symbol");
   PrintF(out, " - hash: %d\n", Hash());
   PrintF(out, " - name: ");
   name()->ShortPrint();
+  PrintF(out, " - private: %d\n", is_private());
   PrintF(out, "\n");
 }
 
 
 void Map::MapPrint(FILE* out) {
   HeapObject::PrintHeader(out, "Map");
   PrintF(out, " - type: %s\n", TypeToString(instance_type()));
   PrintF(out, " - instance size: %d\n", instance_size());
   PrintF(out, " - inobject properties: %d\n", inobject_properties());
   PrintF(out, " - elements kind: ");
@@ skipping 720 matching lines @@
     }
   }
   PrintF(out, "\n");
 }
 
 
 #endif  // OBJECT_PRINT
 
 
 } }  // namespace v8::internal