[Driver][NFC] Improve testing of -fsycl-device-only#2708

romanovvlad merged 2 commits intointel:syclintel/llvm:syclfrom

mdtoguchi:private/mdtoguchi/sycl-device-test-updatemdtoguchi/llvm:private/mdtoguchi/sycl-device-test-updateCopy head branch name to clipboard