[regexp] fix /\W/ui wrt \u017f and \u212a.

src/regexp/regexp-ast.h

Index: src/regexp/regexp-ast.h
diff --git a/src/regexp/regexp-ast.h b/src/regexp/regexp-ast.h
index a45d083cdbde9c4a2bf319ed00db4bbfc447d727..fbe3ebfc72ad24a1174a64224bb46cce43937dd3 100644
--- a/src/regexp/regexp-ast.h
+++ b/src/regexp/regexp-ast.h
@@ -81,6 +81,9 @@ class CharacterRange {
   CharacterRange(void* null) { DCHECK_NULL(null); }  // NOLINT
   static void AddClassEscape(uc16 type, ZoneList<CharacterRange>* ranges,
                              Zone* zone);
+  // Add class escapes. Add case equivalent closure for \w and \W if necessary.
+  static void AddClassEscape(uc16 type, ZoneList<CharacterRange>* ranges,
+                             bool add_unicode_case_equivalents, Zone* zone);
   static Vector<const int> GetWordBounds();
   static inline CharacterRange Singleton(uc32 value) {
     return CharacterRange(value, value);