Move regexp implementation into its own folder.

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

Index: src/regexp/mips/regexp-macro-assembler-mips.h
diff --git a/src/mips/regexp-macro-assembler-mips.h b/src/regexp/mips/regexp-macro-assembler-mips.h
similarity index 97%
rename from src/mips/regexp-macro-assembler-mips.h
rename to src/regexp/mips/regexp-macro-assembler-mips.h
index 42200fcad2267d770ee4bf30ba35bad08da4f683..36fd4b15641a380654c7fe3c54638e47dfc32217 100644
--- a/src/mips/regexp-macro-assembler-mips.h
+++ b/src/regexp/mips/regexp-macro-assembler-mips.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/mips/assembler-mips.h"
-#include "src/mips/macro-assembler-mips.h"
+#include "src/regexp/regexp-macro-assembler.h"
 
 namespace v8 {
 namespace internal {
@@ -222,4 +222,4 @@ class RegExpMacroAssemblerMIPS: public NativeRegExpMacroAssembler {
 
 }}  // namespace v8::internal
 
-#endif  // V8_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_
+#endif  // V8_REGEXP_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_