Made the output of the --trace-representation flag a bit more informative and

src/hydrogen.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 801 matching lines @@
   void VisitExpressions(ZoneList<Expression*>* exprs);
 
   void AddPhi(HPhi* phi);
 
   void PushAndAdd(HInstruction* instr);
 
   // Remove the arguments from the bailout environment and emit instructions
   // to push them as outgoing parameters.
   template <int V> HInstruction* PreProcessCall(HCall<V>* call);
 
-  void AssumeRepresentation(HValue* value, Representation r);
+  void TraceRepresentation(Token::Value op,
+                           TypeInfo info,
+                           HValue* value,
+                           Representation rep);
+  void AssumeRepresentation(HValue* value, Representation rep);
   static Representation ToRepresentation(TypeInfo info);
 
   void SetupScope(Scope* scope);
   virtual void VisitStatements(ZoneList<Statement*>* statements);
 
 #define DECLARE_VISIT(type) virtual void Visit##type(type* node);
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
   HBasicBlock* CreateBasicBlock(HEnvironment* env);
@@ skipping 360 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_