Use `isearch-search-fun' in `perform-replace' (bug#10885, bug#10887).
* lisp/replace.el (replace-search-function) (replace-re-search-function): Set default values to nil. (perform-replace): Let-bind isearch-related variables based on replace-related values, call `isearch-search-fun' and let-bind the result to `search-function'. Remove code that sets `search-function' and `search-string' separately for `delimited-flag'. (replace-highlight): Add new argument `delimited-flag' and rename other arguments to the names used in `perform-replace'. Let-bind `isearch-word' to the argument `delimited-flag'.
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