[clang] [Clang] Support fp16 in libdevice for CUDA 13.3 (PR #174005)

[Artem Belevich via cfe-commits]

Artem-B wrote:

> Portable between different versions of LLVM?
Between NVCC and Clang. The builtins should look the same to the users of both compilers.

https://github.com/llvm/llvm-project/pull/174005