[clang] [clang-tools-extra] [lldb] [clang] Reland: fix getTemplateInstantiationArgs (PR #208285)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

Yeah I have access to that crash reproducer now. The last time such a link was posted, it was during the WG21 committee meeting, and by the time I could try to access it, the link was already expired.

So maybe next time it would be helpful to upload the reproducer here on GitHub.

https://github.com/llvm/llvm-project/pull/208285