turn off memoization for the specified function
Major Section:  EVENTS

(unmemoize 'foo) ; turn off memoization of foo

General Form:
(unmemoize fn)

where fn evaluates to a function symbol that is currently memoized; see memoize. An exception is that as with memoize, fn may evaluate to the name of a macro that is associated with such a function symbol; see macro-aliases-table.

Calls of this macro generate events of the form (table memoize-table fn nil). When successful, the returned value is of the form (mv nil function-symbol state).