Move regexp implementation into its own folder.

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

Index: src/regexp/regexp-macro-assembler-tracer.h
diff --git a/src/regexp-macro-assembler-tracer.h b/src/regexp/regexp-macro-assembler-tracer.h
similarity index 95%
rename from src/regexp-macro-assembler-tracer.h
rename to src/regexp/regexp-macro-assembler-tracer.h
index 8b8d80a15a823dbd523530b2492d7e2e341933ec..d4092ceaad463f1f346dfda0cd10920af706f06e 100644
--- a/src/regexp-macro-assembler-tracer.h
+++ b/src/regexp/regexp-macro-assembler-tracer.h
@@ -2,8 +2,10 @@
 // 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_TRACER_H_
-#define V8_REGEXP_MACRO_ASSEMBLER_TRACER_H_
+#ifndef V8_REGEXP_REGEXP_MACRO_ASSEMBLER_TRACER_H_
+#define V8_REGEXP_REGEXP_MACRO_ASSEMBLER_TRACER_H_
+
+#include "src/regexp/regexp-macro-assembler.h"
 
 namespace v8 {
 namespace internal {
@@ -81,4 +83,4 @@ class RegExpMacroAssemblerTracer: public RegExpMacroAssembler {
 
 }}  // namespace v8::internal
 
-#endif  // V8_REGEXP_MACRO_ASSEMBLER_TRACER_H_
+#endif  // V8_REGEXP_REGEXP_MACRO_ASSEMBLER_TRACER_H_