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

[Rashed Mohammed via cfe-commits]

rashedmyt wrote:

@YonahGoldberg CTK 13.3 has been out, but I do not see half related functions in libdevice. Is it right to assume that this work has not made it into CTK 13.3?

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