[issue39999] Fix some issues with AST node classes

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Yes, and this what PR 19056 does. It is not difficult, and if we can avoid a breakage, why not do this? We have kept all other deprecated classes, like Num and ExtSlice. In 3.10 we can add runtime warnings, and remove them in some future releases.

We alreade got a benefit of simplifying the compiler. Maintaining dummy classes does not cost much.

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