[DAH] Bail on pointer use if ignoring barriers.
Unknown uses of raw pointers should not result in bailing out when an
address is lexical--the destroy of the address will already not be
hoisted over any instructions which may access pointers. If the address
is not lexical however (such as any address when lexical lifetimes are
disabled), that rationale does not apply, so unknown uses of raw
pointers must cause hoisting to bail.
rdar://133969821
