[vm] Implement more efficient CAS in simarm/simarm64 modes, v.2

runtime/vm/debugger.h

 // Copyright (c) 2012, 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.
 
 #ifndef RUNTIME_VM_DEBUGGER_H_
 #define RUNTIME_VM_DEBUGGER_H_
 
 #include "include/dart_tools_api.h"
 
 #include "vm/object.h"
 #include "vm/port.h"
 #include "vm/service_event.h"
+#include "vm/simulator.h"
 
 DECLARE_FLAG(bool, verbose_debug);
 
 // 'Trace Debugger' TD_Print.
 #if defined(_MSC_VER)
 #define TD_Print(format, ...)                                                  \
   if (FLAG_verbose_debug) Log::Current()->Print(format, __VA_ARGS__)
 #else
 #define TD_Print(format, ...)                                                  \
   if (FLAG_verbose_debug) Log::Current()->Print(format, ##__VA_ARGS__)
@@ skipping 766 matching lines @@
   static EventHandler* event_handler_;
 
   friend class Isolate;
   friend class BreakpointLocation;
   DISALLOW_COPY_AND_ASSIGN(Debugger);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_DEBUGGER_H_