Fix LowerAggregateInstrs to avoid lowering move-only types

[atrick]

Fixes rdar://109849028 ([move-only] LowerAggregateInstrs eliminates struct deinitialization)

[atrick]

@swift-ci test

[gottesmm]

@swift-ci smoke test

[atrick]

@gottesmm This PR is exposing a couple of other problems:

The timeout is a concern. My machine was crashing each time I tested locally and I initially thought that was unrelated...

Distributed/distributed_actor_ban_owned_shared.swift' FAILED

swift/test/Distributed/distributed_actor_ban_owned_shared.swift:18:25: error: incorrect message found
  // expected-error@-1{{Copyable types cannot be 'consuming' or 'borrowing' yet}}
                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                        copyable types cannot be 'consuming' or 'borrowing' yet

Interpreter/moveonly_escaping_capture_lifetimes.swift' FAILED
- Timeout

[atrick]

Fixed in #66314