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

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

To be clear, we're asking for a reproducer with normal names first and foremost. I'm thankful for @bgra8 help running `creduce` over what they had, but we wouldn't had this particular conversation if they also provided full original reproducer that we could run `creduce` on with the settings we see fit.

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