[clang] [clang] Enable C++17 relaxed template template argument matching by default (PR #89807)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

@sam-mccall @bgra8 @ericniebler I believe this MR should fix your issues: https://github.com/llvm/llvm-project/pull/91833

Can you double check?

You might consider applying https://github.com/llvm/llvm-project/pull/91837,
since that is stacked on that and will revert the default back to enabling relaxed matching by default. Otherwise, you have to compile with `-frelaxed-template-template-args`.

https://github.com/llvm/llvm-project/pull/89807