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

[Erich Keane via cfe-commits]

erichkeane wrote:

> If you're using `creduce`, this set of arguments disables all renaming passes: `--remove-pass pass_clang rename-fun --remove-pass pass_clang rename-param --remove-pass pass_clang rename-var --remove-pass pass_clang rename-class --remove-pass pass_clang rename-cxx-method --remove-pass pass_clex rename-toks`

This 100% needs to happen ASAP.  @sam-mccall or @bgra8 : Is this something you can provide?

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