X64: Made simpler version of fast-smi-loop code.

src/x64/codegen-x64.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 375 matching lines @@
   void VisitStatementsAndSpill(ZoneList<Statement*>* statements);
 
   // Main code generation function
   void Generate(CompilationInfo* info);
 
   // Generate the return sequence code.  Should be called no more than
   // once per compiled function, immediately after binding the return
   // target (which can not be done more than once).
   void GenerateReturnSequence(Result* return_value);
 
+  // Generate code for a fast smi loop.
+  void GenerateFastSmiLoop(ForStatement* node);
+
   // Returns the arguments allocation mode.
   ArgumentsAllocationMode ArgumentsMode();
 
   // Store the arguments object and allocate it if necessary.
   Result StoreArgumentsObject(bool initial);
 
   // The following are used by class Reference.
   void LoadReference(Reference* ref);
   void UnloadReference(Reference* ref);
 
@@ skipping 641 matching lines @@
     return ObjectBits::encode(object_.code()) |
            AddressBits::encode(addr_.code()) |
            ScratchBits::encode(scratch_.code());
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_CODEGEN_X64_H_