* lisp/savehist.el (savehist-save): Preserve shared structure

This avoids ballooning the size of variables that contain
large text properties, such as the 'yank-handler' installed
by 'evil-yank-rectangle', which contains a list of lines in
the string.
* lisp/savehist.el (savehist-save): Enable 'print-circle'.
(Bug#62364)

Copyright-paperwork-exempt: yes

lisp/savehist.el

@@ -232,8 +232,9 @@ If AUTO-SAVE is non-nil, compare the saved contents to the one last saved,
       savehist-coding-system))
     (run-hooks 'savehist-save-hook)
     (let ((print-length nil)
-	  (print-level nil)
-	  (print-quoted t))
+          (print-level nil)
+          (print-quoted t)
+          (print-circle t))
       ;; Save the minibuffer histories, along with the value of
       ;; savehist-minibuffer-history-variables itself.
       (when savehist-save-minibuffer-history