[clang] [Clang][Sema] Warn when 'exclude_from_explicit_instantiation' attribute is used on local classes and members thereof (PR #88777)

[Erich Keane via cfe-commits]

erichkeane wrote:

> @erichkeane Perhaps the release note should go under "Attribute Changes in Clang"?

That would be fine for me as well.

https://github.com/llvm/llvm-project/pull/88777