[libcxx-commits] [libcxx] [libc++] [NFC] Rename transparency test header & reformat it (PR #175386)

[Rafail Shakhin ogly via libcxx-commits]

rsaddatimov wrote:

> In the title `.hpp` -> `.h`. Also you can shorten the title a bit and write the details in the description which will become the commit message.

Done

https://github.com/llvm/llvm-project/pull/175386