Doug Gregor 0c7707fb88 Derive nonisolated members for protocol conformances ...

When deriving witnesses for protocol conformances within an
actor-isolated type, make those members 'nonisolated'. In the case
where this would work, for example because some of the state is
mutable, don't allow derivation of those witnesses.

Fixes rdar://90233250.

2022-03-25 17:27:25 -07:00

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