RFC: Switch to ast ids (instead of positions) for type feedback.

src/hydrogen-instructions.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 999 matching lines @@
   HSimulate(int ast_id, int pop_count, int environment_height)
       : ast_id_(ast_id),
         pop_count_(pop_count),
         environment_height_(environment_height),
         values_(2),
         assigned_indexes_(2) {}
   virtual ~HSimulate() {}
 
   virtual void PrintDataTo(StringStream* stream) const;
 
-  bool HasAstId() const { return ast_id_ != AstNode::kNoNumber; }
-  int ast_id() const { return ast_id_; }
-  void set_ast_id(int id) {
+  bool HasAstId() const { return ast_id_ != kNoAstId; }
+  AstId ast_id() const { return ast_id_; }
+  void set_ast_id(AstId id) {
     ASSERT(!HasAstId());
     ast_id_ = id;
   }
 
   int environment_height() const { return environment_height_; }
   int pop_count() const { return pop_count_; }
   const ZoneList<HValue*>* values() const { return &values_; }
   int GetAssignedIndexAt(int index) const {
     ASSERT(HasAssignedIndexAt(index));
     return assigned_indexes_[index];
@@ skipping 24 matching lines @@
  private:
   static const int kNoIndex = -1;
   void AddValue(int index, HValue* value) {
     assigned_indexes_.Add(index);
     // Resize the list of pushed values.
     values_.Add(NULL);
     // Set the operand through the base method in HValue to make sure that the
     // use lists are correctly updated.
     SetOperandAt(values_.length() - 1, value);
   }
-  int ast_id_;
+  AstId ast_id_;
   int pop_count_;
   int environment_height_;
   ZoneList<HValue*> values_;
   ZoneList<int> assigned_indexes_;
 };
 
 
 class HStackCheck: public HInstruction {
  public:
   HStackCheck() { }
@@ skipping 1818 matching lines @@
   HValue* object() const { return left(); }
   HValue* key() const { return right(); }
 };
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_