swift234

SILGen: Add bridging support for id-as-Any.

- Previously we didn't know how to bridge address-only types.  Add some
  plumbing for this. Not fully general yet, but with a bit more work we
  could allow resilient value types to adopt _ObjectiveCBridgable, too.
  For now, this is just intended to support the id-as-Any work.

- Specifically when going from a type without any other known bridging
  strategy, emit a call to the new `_bridgeAnythingToObjectiveC` entry
  point from the previous commit.