A64: Implement Smi support in MathAbs

src/a64/stub-cache-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
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@@ skipping 2523 matching lines @@
   }
 
   // Load the (only) argument.
   Register arg = x0;
   __ Peek(arg, 0);
 
   // Check if the argument is a smi.
   Label not_smi;
   __ JumpIfNotSmi(arg, &not_smi);
 
-  __ SmiAbs(arg, x1, &slow);
+  __ SmiAbs(arg, &slow);
   // Smi case done.
   __ Drop(argc + 1);
   __ Ret();
 
   // Check if the argument is a heap number and load its value.
   __ Bind(&not_smi);
   __ CheckMap(
       arg, x1, Heap::kHeapNumberMapRootIndex, &slow, DONT_DO_SMI_CHECK);
   Register value = x1;
   __ Ldr(value, FieldMemOperand(arg, HeapNumber::kValueOffset));
@@ skipping 710 matching lines @@
 
   // Miss case, call the runtime.
   __ Bind(&miss_force_generic);
   TailCallBuiltin(masm, Builtins::kKeyedLoadIC_MissForceGeneric);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64