[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)

[via cfe-commits]

alexfh wrote:

> @bgra8 see #91498

Can you check if it also fixes https://github.com/llvm/llvm-project/pull/90152#issuecomment-2100932093 ? Or should it? 

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