[clang] [clang-tools-extra] Reapply "[Clang][Sema] Diagnose class member access expressions naming non-existent members of the current instantiation prior to instantiation in the absence of dependent base classes (#84050)" (PR #90152)

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

@dyung It's a bit difficult to tell what the code is intended to do. An expression naming a non-static member function must either be the postfix-expression of a call, or be the terminal name of a qualified-id that is the operand of unary `&`.

https://github.com/llvm/llvm-project/pull/90152