* lisp/emacs-lisp/nadvice.el: Support adding a given function multiple times.
(advice--member-p): If name is given, only compare the name. (advice--remove-function): Don't stop at the first match. (advice--normalize-place): New function. (add-function, remove-function): Use it. (advice--add-function): Pass the name, if any, to advice--remove-function.
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