Cleanups based on Kevin's and Florian's suggestions.

runtime/vm/debugger.cc

 // 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.
 
 #include "vm/debugger.h"
 
 #include "include/dart_api.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 1391 matching lines @@
       Array& descriptor = Array::Handle();
       CodePatcher::GetInstanceCallAt(bpt->pc_, &ic_data, &descriptor);
       ArgumentsDescriptor arg_descriptor(descriptor);
       ActivationFrame* top_frame = stack_trace->ActivationFrameAt(0);
       intptr_t num_args = arg_descriptor.Count();
       Instance& receiver =
           Instance::Handle(top_frame->GetInstanceCallReceiver(num_args));
       Code& code =
           Code::Handle(ResolveCompileInstanceCallTarget(receiver,
                                                         ic_data,
-                                                        arg_descriptor));
+                                                        descriptor));
       if (!code.IsNull()) {
         Function& callee = Function::Handle(code.function());
         if (IsDebuggable(callee)) {
           func_to_instrument = callee.raw();
         }
       }
     } else if (bpt->breakpoint_kind_ == PcDescriptors::kFuncCall) {
       func_to_instrument = bpt->function();
       const Code& code = Code::Handle(func_to_instrument.CurrentCode());
       const Function& callee =
@@ skipping 209 matching lines @@
 }
 
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 }  // namespace dart