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

src/type-info.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 244 matching lines @@
   // Get type information for arithmetic operations and compares.
   TypeInfo BinaryType(BinaryOperation* expr, Side side);
   TypeInfo CompareType(CompareOperation* expr, Side side);
   TypeInfo SwitchType(CaseClause* clause);
 
  private:
   void Initialize(Handle<Code> code);
 
   bool IsMonomorphic(int pos) { return GetElement(map_, pos)->IsMap(); }
 
-  ZoneMapList* CollectReceiverTypes(int position,
+  ZoneMapList* CollectReceiverTypes(AstId id,
                                     Handle<String> name,
                                     Code::Flags flags);
 
   void PopulateMap(Handle<Code> code);
 
-  void CollectPositions(Code* code,
-                        List<int>* code_positions,
-                        List<int>* source_positions);
+  void CollectIds(Code* code,
+                  List<int>* code_positions,
+                  List<AstId>* ast_ids);
+
+  void SetInfo(AstId id, Handle<Object> info);
 
   Handle<JSObject> map_;
 
   DISALLOW_COPY_AND_ASSIGN(TypeFeedbackOracle);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TYPE_INFO_H_