[clang] clang: Improve block-scope thread-local diagnostic (PR #234704)

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chandu836 wrote:

Thanks for the guidance. I have read the LLVM AI Tool Use Policy and the code-review guidelines. I have also ensured that my PR description accurately discloses the AI assistance used, as applicable. I understand that I am responsible for the submitted code and am happy to address any review feedback.


https://github.com/llvm/llvm-project/pull/234704