bug#61640: 30.0.50; Help Elisp xref recognize defclass parent classes

[Eric Abrahamsen]

In a form such as this:

(defclass ebdb-field-id (ebdb-field-labeled ebdb-field-obfuscated 
ebdb-field-user)
  ((label-list :initform 'ebdb-id-label-list)
   ...
   ))

All the symbols in

(ebdb-field-labeled ebdb-field-obfuscated ebdb-field-user)

should be recognized by `elisp--xref-infer-namespace' as 'function.
Right now, this is treated like a function call (ie like '(function
variable variable)).

I can't promise that the attached patch is exactly the right thing, but
it ought to be pretty close.

Thanks,
Eric

elispxrefdefclass.diff
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