(top-level): Add jit-lock-mode as new support mode.

(top-level): Add jit-lock-mode as new support mode.
(font-lock-fontify-keywords-region): Stop when
reaching end instead of letting re-search-forward signal an error.
(jit-lock-mode): New.
(font-lock-turn-on-thing-lock): Add jit-lock-mode.
(font-lock-turn-off-thing-lock): Ditto.
(font-lock-after-fontify-buffer): Ditto.
(font-lock-after-unfontify-buffer): Ditto.
(font-lock-comment-face): Add spec for color tty.
(font-lock-string-face): Ditto.
(font-lock-keyword-face): Ditto.
(font-lock-builtin-face): Ditto.
(font-lock-function-name-face): Ditto.
(font-lock-variable-name-face): Ditto.
(font-lock-type-face): Ditto.
(font-lock-constant-face): Ditto.
(font-lock-warning-face): Ditto.
(font-lock-comment-face): Use new face attribute names.
(font-lock-string-face): Ditto.
(font-lock-keyword-face): Ditto.
(font-lock-builtin-face): Ditto.
(font-lock-function-name-face): Ditto.
(font-lock-variable-name-face): Ditto.
(font-lock-type-face): Ditto.
(font-lock-reference-face): Ditto.
(font-lock-warning-face): Ditto.