[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:

@davemgreen you can try using `-fdelayed-template-parsing` to fix the error. A compatibility flag could be added for older code bases -- but I'd like guidance from @erichkeane, @cor3ntin, and/or @AaronBallman on that.

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