[clang] [Clang][Sema] Diagnosis for constexpr constructor not initializing a union member (PR #81225)

[Mariya Podchishchaeva via cfe-commits]

https://github.com/Fznamznon commented:

I don't have anything to add, except release notes nits, but I'd like to someone else to take a look. cc @shafik @cor3ntin @AaronBallman
My question about why can't we do the same as non-template version does remains unanswered.


https://github.com/llvm/llvm-project/pull/81225