[compiler-rt] [compiler-rt] Initial support for builtins on GPU targets (PR #95304)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> It's true for now at least, so we get the `.bc`. I'd love to have an actual object build though, since it would let us resolve things if we ever want the backend to be able to use these.

Nothing is stopping you from building and using the object today. We just aren't going to guarantee a stable ABI for it now

https://github.com/llvm/llvm-project/pull/95304