Move regexp implementation into its own folder.

src/regexp/mips64/regexp-macro-assembler-mips64.h

Index: src/regexp/mips64/regexp-macro-assembler-mips64.h
diff --git a/src/mips64/regexp-macro-assembler-mips64.h b/src/regexp/mips64/regexp-macro-assembler-mips64.h
similarity index 98%
rename from src/mips64/regexp-macro-assembler-mips64.h
rename to src/regexp/mips64/regexp-macro-assembler-mips64.h
index 8ec36a0e78c6d802f077b0646d02e7a9b11ccb52..84c85affbe31f031f6772eced185fc32532f7f08 100644
--- a/src/mips64/regexp-macro-assembler-mips64.h
+++ b/src/regexp/mips64/regexp-macro-assembler-mips64.h
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_
-#define V8_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_
+#ifndef V8_REGEXP_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_
+#define V8_REGEXP_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_
 
 #include "src/macro-assembler.h"
 #include "src/mips64/assembler-mips64.h"
-#include "src/mips64/macro-assembler-mips64.h"
+#include "src/regexp/regexp-macro-assembler.h"
 
 namespace v8 {
 namespace internal {
@@ -264,4 +264,4 @@ class RegExpMacroAssemblerMIPS: public NativeRegExpMacroAssembler {
 
 }}  // namespace v8::internal
 
-#endif  // V8_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_
+#endif  // V8_REGEXP_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_