- fixed a couple things making 5 Mozilla regexp tests pass

        * kjs/regexp_object.cpp: (RegExpProtoFuncImp::call): Implement toString
        for the prototype.
        (RegExpObjectImp::construct): Fix bug where the string "undefined" would
        be used as the flags string when no parameter was passed.

        * kjs/regexp_object.h: (KJS::RegExpPrototypeImp::classInfo):
        Added a class info object for RegExp prototype so it can return
        a string instead of raising an exception when converting to a string.

        * tests/mozilla/expected.html: Update results.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@7175 268f45cc-cd09-0410-ab3c-d52691b4dbfc