[clang] [Clang] Diagnose UB and emit error when identifier has both internal and external linkage (PR #192116)

[Corentin Jabot via cfe-commits]

cor3ntin wrote:

Can you add a test for c++ too? This is https://cplusplus.github.io/CWG/issues/426.html 
@Endilll 

https://github.com/llvm/llvm-project/pull/192116