[clang] [libcxx] [clang] Preserve Qualifiers and type sugar in TemplateNames (PR #93433)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

@nikic Thanks for the heads-up. I expected some impact. There are some ideas to regain that loss in follow up work.

https://github.com/llvm/llvm-project/pull/93433