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

[Shafik Yaghmour 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}}
+#ifndef CXX2A
----------------
shafik wrote:

We normally do this using parameters to `-verify` and using those in the 
expected line e.g. 

https://github.com/llvm/llvm-project/blob/main/clang/test/Parser/cxx2b-lambdas-ext-warns.cpp

CC @AaronBallman 

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