[Concurrency] Don't ignore mismatching isolation for overrides of Clang-imported superclass methods. #74237
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Clang-imported superclass methods.
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Mismatching isolation for overrides is invalid, and there's no reason to ignore this mistake for clang-imported superclasses. This change is staged in behind complete concurrency checking.
This change also removes a bogus fix-it to add global actor isolation to an override if it synchronously calls a global actor isolated method, which won't work.
Resolves: rdar://124409467, #72238