[clang] [libcxx] [llvm] Reapply "[Clang] Implement resolution for CWG1835 (#92957)" (PR #98547)

[Matheus Izvekov via llvm-commits]

mizvekov wrote:

> I'm not sure I follow. If we "treat the `<0>` as a template argument list, even if it isn't unambiguously a template argument list.", then aren't applying CWG1835 at all. 

Yes, in that case. But I am arguing for selectively applying it. I thought that could work, but I am not sure, that's what I am asking.

https://github.com/llvm/llvm-project/pull/98547