bug#21950: 25.1.50; find-lisp-object-file-name sometimes cannot find file-name

[Tino Calancha]

Hi Stephe,

> You are passing 'dired as the TYPE argument, which is undocumented, so
> it's not surprising it doesn't do what you want.

Exactly, that was my example to pointing out the issue.
In emacs version < 25 find-lisp-object-file-name automatically 
replaced 'dired by 'defun, so the user file containing the alias is
always found.

> How did you stumble into this?
I have code relying of such behaviour (probably i should rewrite it in a 
more robust way): it was working fine in emacs24 but since i moved to 
emacs25 doesn't work at all.

Tino