[libc-commits] [libc] [libc] Use `rint` builtin for rounding on the GPU (PR #98345)

[Matt Arsenault via libc-commits]

arsenm wrote:

> Godbolt link is wrong, pointing to sin. This is a directly legal instruction so less explanation is needed too

Might as well handle nearbyint and roundeven too 

https://github.com/llvm/llvm-project/pull/98345