[clang] [Clang][Sema] Diagnosis for constexpr constructor not initializing a union member (PR #81042)

[Mariya Podchishchaeva via cfe-commits]

================
@@ -224,6 +224,9 @@ struct TemplateInit {
   };
   // FIXME: This is ill-formed (no diagnostic required). We should diagnose it.
   constexpr TemplateInit() {} // desired-error {{must initialize all members}}
----------------
Fznamznon wrote:

We've got the desired error, I think :)
```suggestion
  constexpr TemplateInit() {}
```

https://github.com/llvm/llvm-project/pull/81042
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