[clang-tools-extra] [clang] [flang] [libc] [llvm] [clang][Sema] Populate function template depth at AddTemplateOverloadCandidate (PR #80395)

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cor3ntin wrote:

if that's impacting std::format we might want to backport @AaronBallman @erichkeane 

https://github.com/llvm/llvm-project/pull/80395