[clang] [Clang][Sema] Fix mismatch of out-of-line definition of template class (PR #102554)

[Younan Zhang via cfe-commits]

https://github.com/zyn0217 requested changes to this pull request.

I'm sorry but this approach doesn't make sense to me.

I have to say that I self-assigned the issue hours before this patch (I don't know when you started working on it because you haven't explained anything either), and that means I'll look into that recently since I've also been working on another similar case for template packs. Submitting a (especially unreasonable fix) PR without asking first seems to be very impolite behavior.

https://github.com/llvm/llvm-project/pull/102554