A64: Replace a Subs by a Sub where flags don't need to be updated.

src/a64/code-stubs-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 3622 matching lines @@
 
 
 void ICCompareStub::GenerateSmis(MacroAssembler* masm) {
   // Inputs are in x0 (lhs) and x1 (rhs).
   ASSERT(state_ == CompareIC::SMI);
   ASM_LOCATION("ICCompareStub[Smis]");
   Label miss;
   // Bail out (to 'miss') unless both x0 and x1 are smis.
   __ JumpIfEitherNotSmi(x0, x1, &miss);
 
-  // TODO(jbramley): Why do we only set the flags for EQ?
   if (GetCondition() == eq) {
     // For equality we do not care about the sign of the result.
-    __ Subs(x0, x0, x1);
+    __ Sub(x0, x0, x1);
   } else {
     // Untag before subtracting to avoid handling overflow.
     __ SmiUntag(x1);
     __ Sub(x0, x1, Operand::UntagSmi(x0));
   }
   __ Ret();
 
   __ Bind(&miss);
   GenerateMiss(masm);
 }
@@ skipping 2142 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64