[clang] [clang-tools-extra] [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 (PR #84050)

[Paul Kirth via cfe-commits]

ilovepi wrote:

we're seeing similar crashes when building Fuchsia. https://ci.chromium.org/ui/p/fuchsia/builders/ci/clang_toolchain.ci.core.arm64-host_test_only-mac/b8749648123122633169/overview

A reproducer can be found here: https://storage.googleapis.com/fuchsia-artifacts/builds/8749648123122633169/build-debug/clang-crashreports/adc-61853f.tar

https://github.com/llvm/llvm-project/pull/84050