Doug Gregor 56e38b33b6 [SE-0470] Promote isolated-conformance-to-sendable-metatype protocol to error ...

Forming an isolated conformance to a SendableMetatype-inherting
protocol opens up a soundness hole any time the conformance is used.
Reword the recently-introduced diagnostic for this case and promote it
to an error (except when it's preconcurrency).

Fixes rdar://154808002.

2025-07-07 11:35:19 -07:00

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