[clang] [Clang] Implement CWG2598: Union of non-literal types (PR #78195)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

Is this a potentially breaking change since we have expanded what types are considered literals and already existing code may observe this fix?

https://github.com/llvm/llvm-project/pull/78195