Rename A64 port to ARM64 port

src/arm64/utils-arm64.h

Index: src/arm64/utils-arm64.h
diff --git a/src/a64/utils-a64.h b/src/arm64/utils-arm64.h
similarity index 96%
rename from src/a64/utils-a64.h
rename to src/arm64/utils-arm64.h
index 153ce187212e54ed96b2b67fcf0d9b3139e0a723..a1fa12cfa727d54db6bb62e0da80c2d055d51eb0 100644
--- a/src/a64/utils-a64.h
+++ b/src/arm64/utils-arm64.h
@@ -25,12 +25,12 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#ifndef V8_A64_UTILS_A64_H_
-#define V8_A64_UTILS_A64_H_
+#ifndef V8_ARM64_UTILS_ARM64_H_
+#define V8_ARM64_UTILS_ARM64_H_
 
 #include <cmath>
 #include "v8.h"
-#include "a64/constants-a64.h"
+#include "arm64/constants-arm64.h"
 
 #define REGISTER_CODE_LIST(R)                                                  \
 R(0)  R(1)  R(2)  R(3)  R(4)  R(5)  R(6)  R(7)                                 \
@@ -132,4 +132,4 @@ inline float FusedMultiplyAdd(float op1, float op2, float a) {
 
 } }  // namespace v8::internal
 
-#endif  // V8_A64_UTILS_A64_H_
+#endif  // V8_ARM64_UTILS_ARM64_H_