[clang] Fix printing of templated records. (PR #86339)

[Zahira Ammarguellat via cfe-commits]

zahiraam wrote:

Creating a PR with 
`[](PrintingPolicy [[maybe_unused]] & Policy) {
    Policy.SuppressTagKeyword = true;
  };`
  on those tests.

https://github.com/llvm/llvm-project/pull/86339