[libc] [llvm] [libc][math] Refactor bf16addf to header only (PR #181230)

[Muhammad Bassiouni via llvm-commits]

bassiounix wrote:

> Thanks @bassiounix! I've resolved the conflicts. How do I merge the PR?

I can merge on your behalf, but it seems like there's conflicts :)

https://github.com/llvm/llvm-project/pull/181230