Move regexp implementation into its own folder.

src/regexp/regexp-macro-assembler-irregexp-inl.h

Index: src/regexp/regexp-macro-assembler-irregexp-inl.h
diff --git a/src/regexp-macro-assembler-irregexp-inl.h b/src/regexp/regexp-macro-assembler-irregexp-inl.h
similarity index 86%
rename from src/regexp-macro-assembler-irregexp-inl.h
rename to src/regexp/regexp-macro-assembler-irregexp-inl.h
index 294fd2b2446f0d3b59ac51a6903a03d0b0960555..b86d28dfb97aaf4b8ca09d5fe4cdbb3485128300 100644
--- a/src/regexp-macro-assembler-irregexp-inl.h
+++ b/src/regexp/regexp-macro-assembler-irregexp-inl.h
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_REGEXP_MACRO_ASSEMBLER_IRREGEXP_INL_H_
-#define V8_REGEXP_MACRO_ASSEMBLER_IRREGEXP_INL_H_
+#ifndef V8_REGEXP_REGEXP_MACRO_ASSEMBLER_IRREGEXP_INL_H_
+#define V8_REGEXP_REGEXP_MACRO_ASSEMBLER_IRREGEXP_INL_H_
 
 #include "src/ast.h"
-#include "src/bytecodes-irregexp.h"
+#include "src/regexp/bytecodes-irregexp.h"
 
 namespace v8 {
 namespace internal {
@@ -58,4 +58,4 @@ void RegExpMacroAssemblerIrregexp::Emit32(uint32_t word) {
 
 } }  // namespace v8::internal
 
-#endif  // V8_REGEXP_MACRO_ASSEMBLER_IRREGEXP_INL_H_
+#endif  // V8_REGEXP_REGEXP_MACRO_ASSEMBLER_IRREGEXP_INL_H_