Remove saving/restoring of the context at function entry.

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_debugger_api.h"
 
 #include "vm/object.h"
@@ skipping 181 matching lines @@
                                  intptr_t var_ctx_level);
 
   intptr_t TryIndex();
   void GetPcDescriptors();
   void GetVarDescriptors();
   void GetDescIndices();
 
   RawObject* GetLocalVar(intptr_t slot_index);
   RawInstance* GetLocalInstanceVar(intptr_t slot_index);
 
-  RawInstance* GetLocalVarValue(intptr_t slot_index);
-  RawInstance* GetInstanceCallReceiver(intptr_t num_actual_args);
-  RawObject* GetClosureObject(intptr_t num_acatual_args);
-
   uword pc_;
   uword fp_;
   uword sp_;
 
   // The anchor of the context chain for this function.
   Context& ctx_;
   const Code& code_;
   const Function& function_;
   bool token_pos_initialized_;
   intptr_t token_pos_;
@@ skipping 330 matching lines @@
 
   friend class Isolate;
   friend class SourceBreakpoint;
   DISALLOW_COPY_AND_ASSIGN(Debugger);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_DEBUGGER_H_