Add debugger steps in local variable assignments

runtime/vm/intermediate_language.h

 // 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.
 
 #ifndef VM_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 3401 matching lines @@
 
  private:
   const NativeBodyNode& ast_node_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeCallInstr);
 };
 
 
 class DebugStepCheckInstr : public TemplateInstruction<0> {
  public:
-  explicit DebugStepCheckInstr(intptr_t token_pos)
-      : token_pos_(token_pos) {
+  DebugStepCheckInstr(intptr_t token_pos,
+                      PcDescriptors::Kind stub_kind)
+      : token_pos_(token_pos),
+        stub_kind_(stub_kind) {
   }
 
   DECLARE_INSTRUCTION(DebugStepCheck)
 
   intptr_t token_pos() const { return token_pos_; }
   virtual bool MayThrow() const { return false; }
   virtual bool CanDeoptimize() const { return false; }
   virtual EffectSet Effects() const { return EffectSet::All(); }
   virtual intptr_t ArgumentCount() const { return 0; }
   virtual Instruction* Canonicalize(FlowGraph* flow_graph);
 
  private:
   const intptr_t token_pos_;
+  const PcDescriptors::Kind stub_kind_;
 
   DISALLOW_COPY_AND_ASSIGN(DebugStepCheckInstr);
 };
 
 
 enum StoreBarrierType {
   kNoStoreBarrier,
   kEmitStoreBarrier
 };
 
@@ skipping 3661 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_