[clang] [clang] Shard out some small gtest binaries (PR #138021)

[Nico Weber via cfe-commits]

https://github.com/nico approved this pull request.

Very cool, thanks!

Thoughts on https://github.com/llvm/llvm-project/pull/134196#discussion_r2068617059 ? :)

https://github.com/llvm/llvm-project/pull/138021