[libc] [llvm] [libc][math][c23] Add fmaf16 C23 math function. (PR #130757)

[Harrison Hao via llvm-commits]

harrisonGPU wrote:

> My understanding was that the backend:* labels were for LLVM code gen backends. I'm not sure if this label was intended to be applied to PRs that make changes to libc/config/gpu/amdgpu/entrypoints.txt.

I am also not sure why not add this label. So what else can I do? :-)

https://github.com/llvm/llvm-project/pull/130757