A64: Tidy up register use in TaggedToI

test/cctest/test-code-stubs-a64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Rrdistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Rrdistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Rrdistributions 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 69 matching lines @@
     }
   }
   // Re-push the double argument.
   queue.Queue(d0);
 
   queue.PushQueued();
 
   // Call through to the actual stub
   if (inline_fastpath) {
     __ Ldr(d0, MemOperand(source_reg));
-    __ TryInlineTruncateDoubleToI(destination_reg, d0, &done);
+    __ TryConvertDoubleToInt64(destination_reg, d0, &done);
     if (destination_reg.is(source_reg)) {
       // Restore clobbered source_reg.
       __ add(source_reg, jssp, Operand(source_reg_offset));
     }
   }
   __ Call(start, RelocInfo::EXTERNAL_REFERENCE);
   __ bind(&done);
 
   __ Drop(1, kDoubleSize);
 
@@ skipping 79 matching lines @@
                                         false));
       RunAllTruncationTests(
           RunGeneratedCodeCallWrapper,
           MakeConvertDToIFuncTrampoline(isolate,
                                         source_registers[s],
                                         dest_registers[d],
                                         true));
     }
   }
 }