Declare more functions as shift-translatable motion commands

* lisp/comint.el (comint-next-prompt, comint-previous-prompt): Declare
as shift-translatable motion commands.
* lisp/textmodes/sgml-mode.el (sgml-skip-tag-backward)
(sgml-skip-tag-forward): Declare as shift-translatable motion
commands.  (Bug#65876)

lisp/comint.el

@@ -2810,7 +2810,7 @@ If N is negative, find the previous or Nth previous match."
 If `comint-use-prompt-regexp' is nil, then this means the beginning of
 the Nth next `input' field, otherwise, it means the Nth occurrence of
 text matching `comint-prompt-regexp'."
-  (interactive "p")
+  (interactive "^p")
   (if comint-use-prompt-regexp
       ;; Use comint-prompt-regexp
       (let ((paragraph-start comint-prompt-regexp))
@@ -2847,7 +2847,7 @@ text matching `comint-prompt-regexp'."
 If `comint-use-prompt-regexp' is nil, then this means the beginning of
 the Nth previous `input' field, otherwise, it means the Nth occurrence of
 text matching `comint-prompt-regexp'."
-  (interactive "p")
+  (interactive "^p")
   (comint-next-prompt (- n)))
 
 ;; State used by `comint-insert-previous-argument' when cycling.

lisp/textmodes/sgml-mode.el

@@ -923,7 +923,7 @@ With prefix argument, only self insert."
   "Skip to beginning of tag or matching opening tag if present.
 With prefix argument ARG, repeat this ARG times.
 Return non-nil if we skipped over matched tags."
-  (interactive "p")
+  (interactive "^p")
   ;; FIXME: use sgml-get-context or something similar.
   (let ((return t))
     (while (>= arg 1)
@@ -1036,7 +1036,7 @@ an opening markup tag automatically updates the closing tag."
   "Skip to end of tag or matching closing tag if present.
 With prefix argument ARG, repeat this ARG times.
 Return t if after a closing tag."
-  (interactive "p")
+  (interactive "^p")
   ;; FIXME: Use sgml-get-context or something similar.
   ;; It currently might jump to an unrelated </P> if the <P>
   ;; we're skipping has no matching </P>.