[clang] [Clang][Sema] Diagnose friend declarations with enum elaborated-type-specifier in all language modes (PR #80171)

[Krystian Stasiowski via cfe-commits]

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@@ -145,6 +145,7 @@ Improvements to Clang's diagnostics
   prints.
 
 - Clang now diagnoses member template declarations with multiple declarators.
+- Clang now diagnoses friend declarations with an ``enum`` elaborated-type-specifier outside of C++98.
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sdkrystian wrote:

Yes :)

https://github.com/llvm/llvm-project/pull/80171