Complete and clean up breakpoint support in all 3 debuggers embedded in MIPS,

runtime/vm/assembler_mips.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 "vm/globals.h"
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/longjump.h"
 #include "vm/runtime_entry.h"
@@ skipping 1209 matching lines @@
 
 void Assembler::TraceSimMsg(const char* message) {
   // Don't bother adding in the messages unless tracing is enabled, and we are
   // running in the simulator.
 #if defined(USING_SIMULATOR)
   if (FLAG_trace_sim) {
     Label msg;
     b(&msg);
     Emit(reinterpret_cast<int32_t>(message));
     Bind(&msg);
-    break_(Instr::kMsgMessageCode);
+    break_(Instr::kSimulatorMessageCode);
   }
 #endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS