A64: Implement Smi support in MathAbs

test/cctest/test-assembler-a64.cc

 // 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 9146 matching lines @@
 
 
 static void DoSmiAbsTest(int32_t value, bool must_fail = false) {
   SETUP();
 
   START();
   Label end, slow;
   __ Mov(x2, 0xc001c0de);
   __ Mov(x1, value);
   __ SmiTag(x1);
-  __ SmiAbs(x1, x0, &slow);
+  __ SmiAbs(x1, &slow);
   __ SmiUntag(x1);
   __ B(&end);
 
   __ Bind(&slow);
   __ Mov(x2, 0xbad);
 
   __ Bind(&end);
   END();
 
   RUN();
@@ skipping 386 matching lines @@
   AbsHelperX(kXMinInt);
   AbsHelperX(kXMaxInt);
 
   AbsHelperW(0);
   AbsHelperW(42);
   AbsHelperW(-42);
   AbsHelperW(kWMinInt);
   AbsHelperW(kWMaxInt);
 }