A64: Handle a few TODOs.

src/a64/simulator-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 714 matching lines @@
 
   template <typename T>
   T FPMin(T a, T b);
 
   template <typename T>
   T FPMaxNM(T a, T b);
 
   template <typename T>
   T FPMinNM(T a, T b);
 
-  void CheckStackAlignment();
-
   inline void CheckPCSComplianceAndRun();
 
 #ifdef DEBUG
   // Corruption values should have their least significant byte cleared to
   // allow the code of the register being corrupted to be inserted.
   static const uint64_t kCallerSavedRegisterCorruptionValue =
       0xca11edc0de000000UL;
   // This value is a NaN in both 32-bit and 64-bit FP.
   static const uint64_t kCallerSavedFPRegisterCorruptionValue =
       0x7ff000007f801000UL;
@@ skipping 127 matching lines @@
   static void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
 
 #endif  // !defined(USE_SIMULATOR)
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_SIMULATOR_A64_H_