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

src/safepoint-table.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 34 matching lines @@
     return kHeaderSize +
            (length_ * (kPcAndDeoptimizationIndexSize + entry_size_)); }
   unsigned length() const { return length_; }
   unsigned entry_size() const { return entry_size_; }
 
   unsigned GetPcOffset(unsigned index) const {
     ASSERT(index < length_);
     return Memory::uint32_at(GetPcOffsetLocation(index));
   }
 
-  int GetDeoptimizationIndex(unsigned index) const {
+  AstId GetDeoptimizationIndex(unsigned index) const {
     ASSERT(index < length_);
     unsigned value = Memory::uint32_at(GetDeoptimizationLocation(index));
-    return DeoptimizationIndexField::decode(value);
+    return static_cast<AstId>(DeoptimizationIndexField::decode(value));
   }
 
   unsigned GetGapCodeSize(unsigned index) const {
     ASSERT(index < length_);
     unsigned value = Memory::uint32_at(GetDeoptimizationLocation(index));
     return GapCodeSizeField::decode(value);
   }
 
   uint8_t* GetEntry(unsigned index) const {
     ASSERT(index < length_);
@@ skipping 38 matching lines @@
 
   Address pc_and_deoptimization_indexes_;
   Address entries_;
 
   friend class SafepointTableBuilder;
 };
 
 
 class Safepoint BASE_EMBEDDED {
  public:
-  static const int kNoDeoptimizationIndex = 0x00ffffff;
+  static const AstId kNoDeoptimizationIndex = 0x00ffffff;
 
   void DefinePointerSlot(int index) { indexes_->Add(index); }
   void DefinePointerRegister(Register reg) { registers_->Add(reg.code()); }
 
  private:
   Safepoint(ZoneList<int>* indexes, ZoneList<int>* registers) :
       indexes_(indexes), registers_(registers) { }
   ZoneList<int>* indexes_;
   ZoneList<int>* registers_;
 
@@ skipping 52 matching lines @@
 
   bool emitted_;
   unsigned offset_;
 
   DISALLOW_COPY_AND_ASSIGN(SafepointTableBuilder);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SAFEPOINT_TABLE_H_