Add gdb helper functions for creating a handle and using ToCString with RawObjects.

runtime/vm/thread_interrupter_linux.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(HOST_OS_LINUX)
 
 #include <errno.h>  // NOLINT
 
 #include "vm/flags.h"
 #include "vm/os.h"
 #include "vm/profiler.h"
 #include "vm/signal_handler.h"
 #include "vm/thread_interrupter.h"
 
 namespace dart {
 
+#ifndef PRODUCT
+
 DECLARE_FLAG(bool, thread_interrupter);
 DECLARE_FLAG(bool, trace_thread_interrupter);
 
 class ThreadInterrupterLinux : public AllStatic {
  public:
   static void ThreadInterruptSignalHandler(int signal,
                                            siginfo_t* info,
                                            void* context_) {
     if (signal != SIGPROF) {
       return;
@@ skipping 34 matching lines @@
 void ThreadInterrupter::InstallSignalHandler() {
   SignalHandler::Install<
       ThreadInterrupterLinux::ThreadInterruptSignalHandler>();
 }
 
 
 void ThreadInterrupter::RemoveSignalHandler() {
   SignalHandler::Remove();
 }
 
+#endif  // !PRODUCT
 
 }  // namespace dart
 
 #endif  // defined(HOST_OS_LINUX)