[ownership-verifier] Allow owned enum arguments to be passed as guara… #14550
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…nteed function arguments.
Enums require special handling in the ownership verifier since an enum is a sum
type whose triviality or non-triviality is erased at function arguments. When
the ownership verifier was changed to allow for owned values to be passed as
guaranteed objects via instantaneous borrowing, this code was not updated.
rdar://34222540