[clang] [Clang] Ensure default arguments in friend declarations are only allowed in defining declarations to prevent multiple reachable declarations (PR #113777)

[Matheus Izvekov via cfe-commits]

https://github.com/mizvekov approved this pull request.

LGTM except for a couple of nits.

Thanks!

https://github.com/llvm/llvm-project/pull/113777
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