Debugger: ScopeMirror has N^2 algorithm when building closure mirrors. (take 2).

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
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 //     * Redistributions in binary form must reproduce the above
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@@ skipping 3541 matching lines @@
   // parameter index for a given parameter name if the parameter is present;
   // otherwise returns a value < 0. The name must be a symbol (canonicalized).
   int ParameterIndex(String* name);
 
   // Lookup support for serialized scope info. Returns the function context
   // slot index if the function name is present and context-allocated (named
   // function expressions, only), otherwise returns a value < 0. The name
   // must be a symbol (canonicalized).
   int FunctionContextSlotIndex(String* name, VariableMode* mode);
 
+
+  // Copies all the context locals into an object used to materialize a scope.
+  bool CopyContextLocalsToScopeObject(Isolate* isolate,
+                                      Handle<Context> context,
+                                      Handle<JSObject> scope_object);
+
+
   static Handle<ScopeInfo> Create(Scope* scope, Zone* zone);
 
   // Serializes empty scope info.
   static ScopeInfo* Empty();
 
 #ifdef DEBUG
   void Print();
 #endif
 
   // The layout of the static part of a ScopeInfo is as follows. Each entry is
@@ skipping 5378 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_