[clang] [Clang][Sema] fix deducing auto& from const int in template parameters is impossible in partial specializations (PR #79733)

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cor3ntin wrote:

Oh wow, thanks for this fix!
Does it fixes any of these issues? https://github.com/llvm/llvm-project/issues/68885

https://github.com/llvm/llvm-project/pull/79733