Change non-function type aliases tests: get rid of references from a type alias to itself.

[iarkh]

Many of non-function type aliases tests have a reference from a type alias to itself.

The specification says that any self reference in a type alias is a compile-time error, and the use of A<X> as a bound in the declaration of A is such a self reference.

So the tests should be modified to avoid the self reference by using a related type.

In the cases where these declarations reflect a computation of an instantiation to bound the computed result can still be reused: We just need to have a class (where self references are OK!), and that class should have the same bounds that the type alias currently declares.