[clang] [Clang] Avoid assertion failure for initialized extern aliases (PR #223124)

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+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fsyntax-only -verify %s
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keepyixiao wrote:

Thanks for the suggestion! I was able to run alias-redefinition.c in both C and C++ modes without requiring significant diagnostic changes, so I've moved the C++-specific static data member tests there under #ifdef __cplusplus and removed the separate test file.

https://github.com/llvm/llvm-project/pull/223124