* lisp/replace.el (perform-replace): Add `skip-read-only-count',

* lisp/replace.el (perform-replace): Add `skip-read-only-count',
`skip-filtered-count', `skip-invisible-count' let-bound to 0.
Increment them for corresponding conditions and report the number
of skipped occurrences in the final message.
(query-replace, query-replace-regexp, query-replace-regexp-eval)
(replace-string, replace-regexp): Doc fix.

Fixes: debbugs:11746