[TypeChecker] Disallow use of global actor attributes of setters, add… #69219
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…ressors, and observers
No other accessor besides a getter could be marked as async
and adding @mainactor global accessor on setters and other
accessor kinds would mean disconnecting them from a getter
in terms of isolation, so let's keep things simple and allow global
actor attribute on getters and/or enclosing declaration only.
Resolves: rdar://99281333