[llvm] [OFFLOAD][OMP] Move OpenMP kernel argument processing from plugins (PR #213867)

[Joseph Huber via llvm-commits]

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jhuber6 wrote:

Weird that `libomptarget` cares about CUDA at all. @jdoerfert @jellytabby  are we still expecting to route CUDA through `libomptarget`?

https://github.com/llvm/llvm-project/pull/213867