Rename A64 port to ARM64 port

src/arm64/lithium-arm64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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-#ifndef V8_A64_LITHIUM_A64_H_
-#define V8_A64_LITHIUM_A64_H_
+#ifndef V8_ARM64_LITHIUM_ARM64_H_
+#define V8_ARM64_LITHIUM_ARM64_H_
 
 #include "hydrogen.h"
 #include "lithium-allocator.h"
 #include "lithium.h"
 #include "safepoint-table.h"
 #include "utils.h"
 
 namespace v8 {
 namespace internal {
 
@@ skipping 2971 matching lines @@
   // The operand created by UseRegister is guaranteed to be live until the end
   // of the instruction. This means that register allocator will not reuse its
   // register for any other operand inside instruction.
   MUST_USE_RESULT LOperand* UseRegister(HValue* value);
 
   // The operand created by UseRegisterAndClobber is guaranteed to be live until
   // the end of the end of the instruction, and it may also be used as a scratch
   // register by the instruction implementation.
   //
   // This behaves identically to ARM's UseTempRegister. However, it is renamed
-  // to discourage its use in A64, since in most cases it is better to allocate
-  // a temporary register for the Lithium instruction.
+  // to discourage its use in ARM64, since in most cases it is better to
+  // allocate a temporary register for the Lithium instruction.
   MUST_USE_RESULT LOperand* UseRegisterAndClobber(HValue* value);
 
   // The operand created by UseRegisterAtStart is guaranteed to be live only at
   // instruction start. The register allocator is free to assign the same
   // register to some other operand used inside instruction (i.e. temporary or
   // output).
   MUST_USE_RESULT LOperand* UseRegisterAtStart(HValue* value);
 
   // An input operand in a register or a constant operand.
   MUST_USE_RESULT LOperand* UseRegisterOrConstant(HValue* value);
@@ skipping 57 matching lines @@
   LAllocator* allocator_;
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
-#endif  // V8_A64_LITHIUM_A64_H_
+#endif  // V8_ARM64_LITHIUM_ARM64_H_