[clang] [clang] fix lack comparison of declRefExpr in ASTStructuralEquivalence (PR #66041)

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https://github.com/cor3ntin requested changes to this pull request.

Thanks for working on that!
Can you explain why you are comparing declaration only with their name? that seems suspicious to me. Otherwise, I think the intent of the change is correct

https://github.com/llvm/llvm-project/pull/66041