Doug Gregor a3dd168435 Split conformance isolation request to eliminate a reference cycle ...

Inference of conformance isolation needs to check whether all of the
witnesses are nonisolated. However, witness checking looks at
conformance isolation. To break this reference cycle, split the
conformance isolation request into two requests: a "raw" request that
looks at explicitly-specified isolation, and the existing one that
also performs inference. The existing one builds on the "raw" one, as
does a separate path for the conformance checker.

Fixes rdar://152461344.

2025-06-02 23:43:29 -07:00

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