* simple.el (comment-indent-function): New variable, intended to

* simple.el (comment-indent-function): New variable, intended to
	replace comment-indent-hook.
	(comment-indent-hook): Make this default to nil now.
	(indent-for-comment): If comment-indent-hook is non-nil, call it
	for backward compatibility; otherwise, call
	comment-indent-function.
	* bytecomp.el: Declare comment-indent-hook an obsolete variable.