A64: Implement Smi support in MathAbs

src/a64/macro-assembler-a64.h

 // Copyright 2013 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 735 matching lines @@
   inline void SmiUntagToDouble(FPRegister dst,
                                Register src,
                                UntagMode mode = kNotSpeculativeUntag);
   inline void SmiUntagToFloat(FPRegister dst,
                               Register src,
                               UntagMode mode = kNotSpeculativeUntag);
 
   // Compute the absolute value of 'smi' and leave the result in 'smi'
   // register. If 'smi' is the most negative SMI, the absolute value cannot
   // be represented as a SMI and a jump to 'slow' is done.
-  void SmiAbs(Register smi, Register scratch, Label *slow);
+  void SmiAbs(const Register& smi, Label* slow);
 
   inline void JumpIfSmi(Register value,
                         Label* smi_label,
                         Label* not_smi_label = NULL);
   inline void JumpIfNotSmi(Register value, Label* not_smi_label);
   inline void JumpIfBothSmi(Register value1,
                             Register value2,
                             Label* both_smi_label,
                             Label* not_smi_label = NULL);
   inline void JumpIfEitherSmi(Register value1,
@@ skipping 1407 matching lines @@
 #error "Unsupported option"
 #define CODE_COVERAGE_STRINGIFY(x) #x
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 #endif  // V8_A64_MACRO_ASSEMBLER_A64_H_