[clang] [llvm] [Driver][SYCL] Add initial SYCL offload compilation support (PR #107493)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

I reverted the changes due to the failing bots; you can make a new PR with the issues fixed and resubmit for a quick review.

https://github.com/llvm/llvm-project/pull/107493