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be39edfa7b
For a case like:
```
public class C<T> {}
public class D {}
extension C where T : D {
public func foo() {}
}
```
We would indadvertedly drop the extension for `C`
in the doc info, as the superclass constraint would
fail the `isBindableToSuperclassOf` check.
Instead, map the subject type of the constraint
into the context and check if it could be bound to
the superclass. In the example above, this is
trivially true, but for cases where we're mirroring
a protocol extension onto the type, this will
disregard those that don't fulfil the requirements.
Resolves rdar://76868074