(compiled-function-p): New function (bug#56648)

(compiled-function-p): New function (bug#56648)

* lisp/subr.el (compiled-function-p): New function.

* test/lisp/international/ucs-normalize-tests.el (ucs-normalize-part1):
* lisp/gnus/gnus.el (gnus):
* lisp/mh-e/mh-e.el (mh-version):
* lisp/emacs-lisp/macroexp.el (emacs-startup-hook):
* lisp/emacs-lisp/cl-macs.el (compiled-function):
* lisp/emacs-lisp/bytecomp.el (byte-compile-fdefinition)
(byte-compile, display-call-tree):
* lisp/emacs-lisp/byte-opt.el (<toplevel-end>):
* lisp/emacs-lisp/advice.el (ad-compiled-p):
* lisp/cedet/semantic/bovine.el (semantic-bovinate-stream):
* lisp/loadup.el (macroexpand-all):
* admin/unidata/unidata-gen.el (unidata--ensure-compiled): Use it.

* lisp/emacs-lisp/pcase.el (pcase-mutually-exclusive-predicates):
Add entries for it.
(pcase--split-pred): Use it.

* lisp/help-fns.el (help-fns-function-description-header): Use `functionp`.
(help-fns--var-safe-local): Use `compiled-function-p`.