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

[A. Jiang via libcxx-commits]

frederick-vs-ja wrote:

> 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.

Hmm, previous we formatted container tests in #126499... I think it's reasonable to format all regex tests for a similar reason too.

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