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

[Matt Arsenault via llvm-commits]

arsenm wrote:

> That way we don't need 50 different builds and we get ISA linking that's correct.

The compatibility window isn't that big, we should be able to start using the new generic targets for this too. But ultimately I don't see this as a big deal.

Part of my compiler-rt interest is it's a restricted support case where we can start with object linking  


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