[libc] [llvm] [libc][math][c23] Add fsqrtf16 C23 math functions. (PR #131153)

[Harrison Hao via llvm-commits]

harrisonGPU wrote:

> The function with `float16` input and `float16` output should be named `sqrtf16`, not `fsqrtf16`.

Hi Tue. Do you mean that `fsqrtf16` takes a float as input and returns a float16? I also noticed that `fmodf16` uses float16 for both its input and output. So I am not sure.

https://github.com/llvm/llvm-project/pull/131153