[clang] [llvm] [Driver][SYCL] Add initial SYCL offload compilation support (PR #117268)

[Michael Toguchi via cfe-commits]

mdtoguchi wrote:

@MaskRay - thank you for the review.  I have made the updates as suggested, please have another look when time permits.

https://github.com/llvm/llvm-project/pull/117268