[arm] Clean up the use of UNALIGNED_ACCESSES.

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

 // 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/regexp/arm64/regexp-macro-assembler-arm64.h"
 
 #include "src/code-stubs.h"
 #include "src/log.h"
@@ skipping 1345 matching lines @@
     CompareAndBranchOrBacktrack(current_input_offset(),
                                 -cp_offset * char_size(), ge, on_outside_input);
   } else {
     __ Add(w12, current_input_offset(), Operand(cp_offset * char_size()));
     __ Cmp(w12, string_start_minus_one());
     BranchOrBacktrack(le, on_outside_input);
   }
 }
 
 
-bool RegExpMacroAssemblerARM64::CanReadUnaligned() {
-  // TODO(pielan): See whether or not we should disable unaligned accesses.
-  return !slow_safe();
-}
-
-
 // Private methods:
 
 void RegExpMacroAssemblerARM64::CallCheckStackGuardState(Register scratch) {
   // Allocate space on the stack to store the return address. The
   // CheckStackGuardState C++ function will override it if the code
   // moved. Allocate extra space for 2 arguments passed by pointers.
   // AAPCS64 requires the stack to be 16 byte aligned.
   int alignment = masm_->ActivationFrameAlignment();
   DCHECK_EQ(alignment % 16, 0);
   int align_mask = (alignment / kXRegSize) - 1;
@@ skipping 279 matching lines @@
     }
   }
 }
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64