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

[Younan Zhang via cfe-commits]

zyn0217 wrote:

BTW, can you flesh out the commit message so we don't just have a single issue 
link there? Thanks

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