Move regexp implementation into its own folder.

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_ARM64_REGEXP_MACRO_ASSEMBLER_ARM64_H_
-#define V8_ARM64_REGEXP_MACRO_ASSEMBLER_ARM64_H_
+#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"
 
 namespace v8 {
 namespace internal {
 
 
 #ifndef V8_INTERPRETED_REGEXP
 class RegExpMacroAssemblerARM64: public NativeRegExpMacroAssembler {
  public:
   RegExpMacroAssemblerARM64(Isolate* isolate, Zone* zone, Mode mode,
                             int registers_to_save);
@@ skipping 263 matching lines @@
   Label exit_label_;
   Label check_preempt_label_;
   Label stack_overflow_label_;
 };
 
 #endif  // V8_INTERPRETED_REGEXP
 
 
 }}  // namespace v8::internal
 
-#endif  // V8_ARM64_REGEXP_MACRO_ASSEMBLER_ARM64_H_
+#endif  // V8_REGEXP_ARM64_REGEXP_MACRO_ASSEMBLER_ARM64_H_