Allan Shortlidge 0d23dc6346 Sema: Ban unavailable deinits. ...

Destructors are always called if declared, so allowing deinit to be declared as
unavailable (or potentially unavailable) creates a type checking loophole that
allows unavailable code to execute at runtime:

```
class C {
  @available(*, unavailable)
  deinit {
    print("Oops")
  }
}

_ = C() // prints "Oops"
```

Resolves rdar://106409012 and https://github.com/apple/swift/issues/63854.

2023-04-01 14:30:35 -07:00

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