[clang] [clang-repl] Fix Lexical DeclContext Mismatch Inside Namespaces (PR #206807)

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yashg16422-design wrote:

@github-actions[bot] I have read the LLVM Developer Policy, Code Review Policy, and AI Tool Use Policy. I used AI assistance (Claude) during investigation and development of this fix. The root cause analysis, code changes, and testing were performed and verified by me locally.


https://github.com/llvm/llvm-project/pull/206807