a bug in font lock for c++ code

[zwz]

I find that my c++ code does not show in color after an update of emacs 
recently.

As far as I can figure out, the problem can be reproduced by:
(defun my-c-mode-common-hook()
 (font-lock-add-keywords nil
    '(("\\<\\(FIXME\\):" 1 font-lock-warning-face prepend)
      ("\\<\\(and\\|or\\|not\\)\\>" .
       font-lock-keyword-face))))
(add-hook 'c++-mode-hook 'my-c-mode-common-hook)

I am running GNU Emacs 24.0.50.1 (i386-mingw-nt6.0.6002) of 2010-05-21.