Doug Gregor 0b01b55e73 Remove an old restriction on _ObjectiveCBridgeable conformances. ...

Historically, we checked against a specific allowlist for a certain set
of types that were allowed to introduce an `_ObjectiveCBridgeable`
conformance in a different module that where the type was defined.
This rigid allow-list isn't really buying us much, but it's getting in
the way of some refactoring for swift-foundation that's changing
the layering. Remove this diagnostic, since it really isn't buying us
much nowadays, and we have the more general warnings about retroactive
conformances to make folks think twice.

2024-02-06 16:09:17 -08:00

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