Pavel Yaskevich 414295df96 [AST] @preconcurrency conformance applies to implied conformances as well ...

A `@preconcurrency` conformance to an inherited protocol should imply
`@preconcurrency` on its parents as well. For example:

```swift
protocol Parent {
  func a()
}

protocol Child: Parent {
  func b()
}

@MainActor
class Test: @preconcurrency Child {
  func a() {
  }

  func b() {
  }
}
```

`Test` conformance to `Parent` implied by its conformance to `Child`
should carry `@preconcurrency` and inject dynamic actor isolation checks
to witness of `a()`.

Resolves: https://github.com/apple/swift/issues/74294
Resolves: rdar://129599097

2024-06-11 15:52:41 -07:00

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