[SILOptimizer] Let visitTransitiveEndBorrows take SILValues. #41007
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Previously, visitTransitiveEndBorrows took BorrowedValues. However,
there is at least one kind of borrow--namely,
unchecked_ownership_conversion insts--that is not currently permitted by
the BorrowedValue API. The long term fix is to make BorrowedValue
handle such instructions. For now, change visitTransitiveEndBorrows to
take SILValues so that unchecked_ownership_conversion can be passed to
the API.
rdar://87985420