Move regexp implementation into its own folder.

src/regexp/regexp-macro-assembler.cc

 // Copyright 2012 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.
 
 #include "src/v8.h"
 
 #include "src/assembler.h"
 #include "src/ast.h"
-#include "src/regexp-macro-assembler.h"
-#include "src/regexp-stack.h"
+#include "src/regexp/regexp-macro-assembler.h"
+#include "src/regexp/regexp-stack.h"
 #include "src/simulator.h"
 
 namespace v8 {
 namespace internal {
 
 RegExpMacroAssembler::RegExpMacroAssembler(Isolate* isolate, Zone* zone)
     : slow_safe_compiler_(false),
       global_mode_(NOT_GLOBAL),
       isolate_(isolate),
       zone_(zone) {}
@@ skipping 281 matching lines @@
   }
   *stack_base = new_stack_base;
   intptr_t stack_content_size = old_stack_base - stack_pointer;
   return new_stack_base - stack_content_size;
 }
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }  // namespace internal
 }  // namespace v8