[regexp] implement case-insensitive unicode regexps.

src/regexp/regexp-parser.h

Index: src/regexp/regexp-parser.h
diff --git a/src/regexp/regexp-parser.h b/src/regexp/regexp-parser.h
index dc0d943f86eeb9860d4819c503b4cf3d3b1e2d6d..7f84d56a9cf9bb92846f77119bf70eec3459c887 100644
--- a/src/regexp/regexp-parser.h
+++ b/src/regexp/regexp-parser.h
@@ -106,6 +106,7 @@ class RegExpBuilder : public ZoneObject {
   // following quantifier
   void AddEmpty();
   void AddCharacterClass(RegExpCharacterClass* cc);
+  void AddCharacterClass(uc32 c);
   void AddAtom(RegExpTree* tree);
   void AddTerm(RegExpTree* tree);
   void AddAssertion(RegExpTree* tree);
@@ -122,8 +123,11 @@ class RegExpBuilder : public ZoneObject {
   void FlushCharacters();
   void FlushText();
   void FlushTerms();
+  bool NeedsDesugaringForUnicode(ZoneList<CharacterRange>* ranges);
+  bool NeedsDesugaringForIgnoreCase(uc32 c);
   Zone* zone() const { return zone_; }
   bool unicode() const { return (flags_ & JSRegExp::kUnicode) != 0; }
+  bool ignore_case() const { return (flags_ & JSRegExp::kIgnoreCase) != 0; }
 
   Zone* zone_;
   bool pending_empty_;