[clang] [Clang][Sema] Fix issue on requires expression with templated base class member function (PR #85198)

[Erich Keane via cfe-commits]

https://github.com/erichkeane approved this pull request.

Ah, I had missed (thanks github review tool!) that the 'ImplicitObjectMember' part already existed.  Sorry for that.

https://github.com/llvm/llvm-project/pull/85198