Don't force representations in the loop builder.

src/hydrogen.h

 // Copyright 2012 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 1199 matching lines @@
     LoopBuilder(HGraphBuilder* builder,
                 HValue* context,
                 Direction direction);
     ~LoopBuilder() {
       ASSERT(finished_);
     }
 
     HValue* BeginBody(
         HValue* initial,
         HValue* terminating,
-        Token::Value token,
-        Representation input_representation = Representation::Integer32());
+        Token::Value token);
     void EndBody();
 
    private:
     Zone* zone() { return builder_->zone(); }
 
     HGraphBuilder* builder_;
     HValue* context_;
     HInstruction* increment_;
     HPhi* phi_;
     HBasicBlock* header_block_;
@@ skipping 790 matching lines @@
   EmbeddedVector<char, 64> filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_