Ported ia32 optimization of revision 3487 to x64.

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 466 matching lines @@
                                     OverwriteMode overwrite_mode);
 
   // Emit code to perform a binary operation on two likely smis.
   // The code to handle smi arguments is produced inline.
   // Consumes the Results *left and *right.
   Result LikelySmiBinaryOperation(Token::Value op,
                                   Result* left,
                                   Result* right,
                                   OverwriteMode overwrite_mode);
 
-  void Comparison(Condition cc,
+  void Comparison(AstNode* node,
+                  Condition cc,
                   bool strict,
                   ControlDestination* destination);
 
   // To prevent long attacker-controlled byte sequences, integer constants
   // from the JavaScript source are loaded in two parts if they are larger
   // than 16 bits.
   static const int kMaxSmiInlinedBits = 16;
   bool IsUnsafeSmi(Handle<Object> value);
   // Load an integer constant x into a register target using
   // at most 16 bits of user-controlled data per assembly operation.
@@ skipping 319 matching lines @@
   Major MajorKey() { return StringCompare; }
   int MinorKey() { return 0; }
 
   void Generate(MacroAssembler* masm);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_CODEGEN_X64_H_