[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:

Looks like `ActOnDependentIdExpression` tries to build a `DependentScopeDeclRefExpr`, which fails because `BuildDependentDeclRefExpr` returns `ExprError()` if no qualifier is present. I'll open a PR shortly.

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