DBC: Fix not-stopping/crashing at fast Smi op breakpoints.

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 VM_DEBUGGER_H_
 #define VM_DEBUGGER_H_
 
 #include "include/dart_tools_api.h"
 
 #include "vm/object.h"
@@ skipping 217 matching lines @@
   CodeBreakpoint* next_;
 
   RawPcDescriptors::Kind breakpoint_kind_;
 #if !defined(TARGET_ARCH_DBC)
   RawCode* saved_value_;
 #else
   // When running on the DBC interpreter we patch bytecode in place with
   // DebugBreak. This is an instruction that was replaced. DebugBreak
   // will execute it after the breakpoint.
   Instr saved_value_;
+  Instr saved_value_fastsmi_;
 #endif
 
   friend class Debugger;
   DISALLOW_COPY_AND_ASSIGN(CodeBreakpoint);
 };
 
 
 // ActivationFrame represents one dart function activation frame
 // on the call stack.
 class ActivationFrame : public ZoneAllocated {
@@ skipping 394 matching lines @@
 
   friend class Isolate;
   friend class BreakpointLocation;
   DISALLOW_COPY_AND_ASSIGN(Debugger);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_DEBUGGER_H_