bug#64580: 30.0.50; Comment describing Lisp_Overlay object in src/lisp.h:2590 is not current

[Eli Zaretskii <eliz@gnu.org>]

> From: Ihor Radchenko <yantar92@posteo.net>
> Date: Wed, 12 Jul 2023 12:47:30 +0000
> 
> /* START and END are markers in the overlay's buffer, and
>    PLIST is the overlay's property list.  */
> struct Lisp_Overlay
> /* An overlay's real data content is:
>    - plist
>    - buffer (really there are two buffer pointers, one per marker,
>      and both points to the same buffer)
>    - insertion type of both ends (per-marker fields)
>    - start & start byte (of start marker)
>    - end & end byte (of end marker)
>    - next (singly linked list of overlays)
>    - next fields of start and end markers (singly linked list of markers).
>    I.e. 9words plus 2 bits, 3words of which are for external linked lists.
> */
>   {
>     union vectorlike_header header;
>     Lisp_Object plist;
>     struct buffer *buffer;        /* eassert (live buffer || NULL). */
>     struct itree_node *interval;
>   } GCALIGNED_STRUCT;
> 
> START and END are no longer in the struct. NEXT fields are also no
> longer applicable, even via itree_node struct.

Thanks, fixed on the emacs-29 branch.