Consistenly use stderr for printing simulator and debug messages

src/a64/simulator-a64.h

 // Copyright 2013 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 176 matching lines @@
   uint8_t value_[kSizeInBytes];
 };
 typedef SimRegisterBase<kXRegSizeInBytes> SimRegister;      // r0-r31
 typedef SimRegisterBase<kDRegSizeInBytes> SimFPRegister;    // v0-v31
 
 
 class Simulator : public DecoderVisitor {
  public:
   explicit Simulator(Decoder* decoder,
                      Isolate* isolate = NULL,
-                     FILE* stream = stdout);
+                     FILE* stream = stderr);
   ~Simulator();
 
   // System functions.
 
   static void Initialize(Isolate* isolate);
 
   static Simulator* current(v8::internal::Isolate* isolate);
 
   // Call an arbitrary function taking an arbitrary number of arguments. The
   // varargs list must be a set of arguments with type CallArgument, and
@@ skipping 642 matching lines @@
   static inline void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
 
 #endif  // !defined(USE_SIMULATOR)
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_SIMULATOR_A64_H_