[libc-commits] [libc] [libc][math][c++23] Add log2bf16 math function (PR #177275)

[via libc-commits]

https://github.com/Sukumarsawant commented:

Missing `freebsd` entrypoint, bazel, and registering in cmakelists `libc/test/shared/CMakeLists.txt` and some below nits 

https://github.com/llvm/llvm-project/pull/177275