Doug Gregor 25a7988982 Teach witness thunks to hop to the actor when needed. ...

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.

Fixes #58517 / rdar://92881539.

2022-06-14 16:45:28 -07:00

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