Mark HChange that convert to int32 with truncation with the appropiate flag....

src/hydrogen.h

 // Copyright 2011 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 284 matching lines @@
                            BitVector* visited,
                            ZoneList<HBasicBlock*>* order,
                            HBasicBlock* loop_header);
   HConstant* GetConstant(SetOncePointer<HConstant>* pointer,
                          Object* value);
 
   void InsertTypeConversions(HInstruction* instr);
   void PropagateMinusZeroChecks(HValue* value, BitVector* visited);
   void InsertRepresentationChangeForUse(HValue* value,
                                         HValue* use,
-                                        Representation to,
-                                        bool truncating);
+                                        Representation to);
   void InsertRepresentationChanges(HValue* current);
   void InferTypes(ZoneList<HValue*>* worklist);
   void InitializeInferredTypes(int from_inclusive, int to_inclusive);
   void CheckForBackEdge(HBasicBlock* block, HBasicBlock* successor);
 
   int next_block_id_;
   CompilationInfo* info_;
   HEnvironment* start_environment_;
   ZoneList<HBasicBlock*> blocks_;
   ZoneList<HValue*> values_;
@@ skipping 761 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_