Teach witness thunks to hop to the actor when needed #59456
Merged
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When a synchronous, actor-isolated declaration witnesses an
asynchronous, not-similarly-isolated requirement, emit an actor hop
within the witness thunk to ensure that we properly enter the context
of the actor.
When the witness is distributed, we go through the distributed thunk
rather than hopping to the actor.
Fixes #58517 / rdar://92881539.