[clang] [clang][Sema] fix crash on __type_pack_element with dependent packs (GH180307) (PR #180407)

[via cfe-commits]

Serosh-commits wrote:

> If AI was used, please disclose it in PR description. And to what extent it was used.
> 
> https://llvm.org/docs/AIToolPolicy.html



> If AI was used, please disclose it in PR description. And to what extent it was used.
> 
> https://llvm.org/docs/AIToolPolicy.html

The logic and code  is all mine. I just used LLMs to help double-check test  and for refining the test cases  and CI issues Updated the description

https://github.com/llvm/llvm-project/pull/180407