Preserve Smi representation of non-escaping fields.

src/hydrogen-escape-analysis.h

 // Copyright 2013 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 44 matching lines @@
 
   HCapturedObject* NewState(HInstruction* prev);
   HCapturedObject* NewStateForAllocation(HInstruction* prev);
   HCapturedObject* NewStateForLoopHeader(HInstruction* prev, HCapturedObject*);
   HCapturedObject* NewStateCopy(HInstruction* prev, HCapturedObject* state);
 
   HPhi* NewPhiAndInsert(HBasicBlock* block, HValue* incoming_value, int index);
 
   HValue* NewMapCheckAndInsert(HCapturedObject* state, HCheckMaps* mapcheck);
 
+  void ReplaceFieldLoadWithValue(HLoadNamedField* load, HValue* load_value);
+
   HCapturedObject* StateAt(HBasicBlock* block) {
     return block_states_.at(block->block_id());
   }
 
   void SetStateAt(HBasicBlock* block, HCapturedObject* state) {
     block_states_.Set(block->block_id(), state);
   }
 
   // List of allocations captured during collection phase.
   ZoneList<HInstruction*> captured_;
 
   // Number of captured objects on which scalar replacement was done.
   int number_of_objects_;
 
   // Number of scalar values tracked during scalar replacement phase.
   int number_of_values_;
   int cumulative_values_;
 
   // Map of block IDs to the data-flow state at block entry during the
   // scalar replacement phase.
   ZoneList<HCapturedObject*> block_states_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_ESCAPE_ANALYSIS_H_