[RFC] Use the 'new' offloding driver for CUDA and HIP compilation by default

I’m unclear on the exact set of tradeoffs here but am strongly in favour of making openmp, cuda, hip and any other single source GPU language compilation as similar as we can. All using the same “new driver” sounds good, especially if we delete the “old driver” relatively promptly after getting any apparent regressions fixed. Making clang simpler is a good thing.

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