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

[Hristo Hristov via libcxx-commits]

Zingam wrote:

With the ongoing work in making the containers constexpr compatible, I find it was good that it was already formatted, as several new contributors joined in.

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