Make point-at-eol and point-at-bol obsolete

* lisp/subr.el (point-at-eol, point-at-bol): Make XEmacs compat
aliases obsolete in favor of `pos-bol'/'line-beginning-position' or
'pos-eol'/'line-end-position'.  Update callers.
Ref: https://lists.gnu.org/r/emacs-devel/2022-08/msg00853.html

lisp/emacs-lisp/backtrace.el

@@ -591,7 +591,7 @@ content of the sexp."
          (begin (previous-single-property-change end 'backtrace-form
                                                  nil (point-min))))
     (unless tag
-      (when (or (= end (point-max)) (> end (point-at-eol)))
+      (when (or (= end (point-max)) (> end (line-end-position)))
         (user-error "No form here to reformat"))
       (goto-char end)
       (setq pos end

lisp/emacs-lisp/bytecomp.el

@@ -1235,7 +1235,8 @@ Order is by depth-first search."
                     (let (new-l new-c)
                       (save-excursion
                         (goto-char offset)
-                        (setq new-l (1+ (count-lines (point-min) (point-at-bol)))
+                        (setq new-l (1+ (count-lines (point-min)
+                                                     (line-beginning-position)))
                               new-c (1+ (current-column)))
                         (format "%d:%d:" new-l new-c))))
 		""))

lisp/emacs-lisp/chart.el

@@ -526,9 +526,9 @@ cons cells of the form (NAME . NUM).  See `sort' for more details."
 (defun chart-zap-chars (n)
   "Zap up to N chars without deleting EOLs."
   (if (not (eobp))
-      (if (< n (- (point-at-eol) (point)))
+      (if (< n (- (line-end-position) (point)))
 	  (delete-char n)
-	(delete-region (point) (point-at-eol)))))
+        (delete-region (point) (line-end-position)))))
 
 (defun chart-display-label (label dir zone start end &optional face)
   "Display LABEL in direction DIR in column/row ZONE between START and END.