X64: Change some smi operations to work on untagged integers instead.

src/x64/assembler-x64.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 747 matching lines @@
   void imul(Register src);                               // rdx:rax = rax * src.
   void imul(Register dst, Register src);                 // dst = dst * src.
   void imul(Register dst, const Operand& src);           // dst = dst * src.
   void imul(Register dst, Register src, Immediate imm);  // dst = src * imm.
   // Signed 32-bit multiply instructions.
   void imull(Register dst, Register src);                 // dst = dst * src.
   void imull(Register dst, Register src, Immediate imm);  // dst = src * imm.
 
   void incq(Register dst);
   void incq(const Operand& dst);
+  void incl(Register dst);
   void incl(const Operand& dst);
 
   void lea(Register dst, const Operand& src);
   void leal(Register dst, const Operand& src);
 
   // Multiply rax by src, put the result in rdx:rax.
   void mul(Register src);
 
   void neg(Register dst);
   void neg(const Operand& dst);
@@ skipping 637 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_ASSEMBLER_X64_H_