[libcxx-commits] [libcxx] [libc++][test][NFC] Clang-format `<regex>` tests (PR #164367)

[Nikolas Klauser via libcxx-commits]

https://github.com/philnik777 requested changes to this pull request.

Please don't format all the tests just because there might be something coming up. If there is actually something we can do that in a targeted manner instead.

https://github.com/llvm/llvm-project/pull/164367