[arm] Clean up the use of UNALIGNED_ACCESSES.

src/regexp/arm64/regexp-macro-assembler-arm64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_REGEXP_ARM64_REGEXP_MACRO_ASSEMBLER_ARM64_H_
 #define V8_REGEXP_ARM64_REGEXP_MACRO_ASSEMBLER_ARM64_H_
 
 #include "src/arm64/assembler-arm64.h"
 #include "src/macro-assembler.h"
 #include "src/regexp/regexp-macro-assembler.h"
@@ skipping 73 matching lines @@
   virtual void PushRegister(int register_index,
                             StackCheckFlag check_stack_limit);
   virtual void ReadCurrentPositionFromRegister(int reg);
   virtual void ReadStackPointerFromRegister(int reg);
   virtual void SetCurrentPositionFromEnd(int by);
   virtual void SetRegister(int register_index, int to);
   virtual bool Succeed();
   virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
   virtual void ClearRegisters(int reg_from, int reg_to);
   virtual void WriteStackPointerToRegister(int reg);
-  virtual bool CanReadUnaligned();
 
   // Called from RegExp if the stack-guard is triggered.
   // If the code object is relocated, the return address is fixed before
   // returning.
   static int CheckStackGuardState(Address* return_address,
                                   Code* re_code,
                                   Address re_frame,
                                   int start_offset,
                                   const byte** input_start,
                                   const byte** input_end);
@@ skipping 183 matching lines @@
   Label stack_overflow_label_;
 };
 
 #endif  // V8_INTERPRETED_REGEXP
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_REGEXP_ARM64_REGEXP_MACRO_ASSEMBLER_ARM64_H_