A64: a smi can hold any signed integer, so we don't need a deferred tag method for it

src/a64/lithium-codegen-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 147 matching lines @@
   void DoDeferredNumberTagD(LNumberTagD* instr);
   void DoDeferredStackCheck(LStackCheck* instr);
   void DoDeferredRandom(LRandom* instr);
   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
   void DoDeferredMathAbsTagged(LMathAbsTagged* instr,
                                Label* exit,
                                Label* allocation_entry);
 
   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
-  void DoDeferredNumberTagI(LInstruction* instr,
+  void DoDeferredNumberTagU(LInstruction* instr,
                             LOperand* value,
                             LOperand* temp1,
-                            LOperand* temp2,
-                            IntegerSignedness signedness);
+                            LOperand* temp2);
   void DoDeferredTaggedToI(LTaggedToI* instr,
                            LOperand* value,
                            LOperand* temp1,
                            LOperand* temp2);
   void DoDeferredAllocate(LAllocate* instr);
 
   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr);
 
   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
   void EmitGoto(int block);
@@ skipping 297 matching lines @@
 
  protected:
   MacroAssembler* masm() const { return codegen_->masm(); }
 
   LCodeGen* codegen_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_LITHIUM_CODEGEN_A64_H_