Fix GCMole issue.

src/debug.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 2107 matching lines @@
       }
 
       // Make sure that the shared full code is compiled with debug
       // break slots.
       if (!shared->code()->has_debug_break_slots()) {
         // Try to compile the full code with debug break slots. If it
         // fails just keep the current code.
         bool prev_force_debugger_active =
             isolate_->debugger()->force_debugger_active();
         isolate_->debugger()->set_force_debugger_active(true);
-        function->ReplaceCode(*Compiler::GetCodeForDebugging(function));
+        Handle<Code> code = Compiler::GetCodeForDebugging(function);
+        function->ReplaceCode(*code);
         isolate_->debugger()->set_force_debugger_active(
             prev_force_debugger_active);
       }
 
       // Keep function code in sync with shared function info.
       function->set_code(shared->code());
     }
 
     RedirectActivationsToRecompiledCodeOnThread(isolate_,
                                                 isolate_->thread_local_top());
@@ skipping 1682 matching lines @@
     {
       Locker locker(reinterpret_cast<v8::Isolate*>(isolate_));
       isolate_->debugger()->CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal