[clang] [clang-tools-extra] [clang] NFCI: use TemplateArgumentLoc for NTTP DefaultArgument (PR #92852)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

> Can you try to explain the what the patch does more and describe the rationale?

Done.

https://github.com/llvm/llvm-project/pull/92852