CWG3093 [basic.def.odr] Definition of "set of potential results" should handle direct base class relationships

[timsong-cpp]

Full name of submitter (unless configured in github; will be published with the issue): Tim Song

Reference (section label): [basic.def.odr]

Link to reflector thread (if any):

Issue description:

Presumably a class member access expression where the rhs designates a direct base class relationship should be handled like non-static data members (see https://eel.is/c++draft/basic.def.odr#3.3).

Suggested resolution:

[jensmaurer]

CWG3093