[clang] [clang] require template arg list after template kw (PR #80801)

[Erick Velez via cfe-commits]

evelez7 wrote:

I was wondering why the Windows CI was failing but seems to be bugged according to Discourse. Newest commit changes the error to a pedantic warning that defaults to an error.

https://github.com/llvm/llvm-project/pull/80801