bug#8667: 24.0.50; `bounds-of-thing-at-point' returns (N . N) for `comment'

[Drew Adams]

> I think `forward-whitespace' is incorrect: \n should be \n+, like this:
> 
> (defun forward-whitespace (arg)
>   (interactive "p")
>   (if (natnump arg)
>       (re-search-forward "[ \t]+\\|\n+" nil 'move arg)
>     (while (< arg 0)
>       (if (re-search-backward "[ \t]+\\|\n+" nil 'move)
>         (or (eq (char-after (match-beginning 0)) 10)
>             (skip-chars-backward " \t")))
>       (setq arg (1+ arg)))))

Note too that `forward-whitespace' is not currently used anywhere in the Emacs
source files.  Can we please make this change, so that it always moves over all
contiguous whitespace and so takes point up to a non-whitespace char (or eob)?