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

[Alex Duran via llvm-commits]

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adurang wrote:

I thought this was used for the kernel language extensions in OpenMP (I think CUDA is a really bad name here). In any case it was inside the PluginInterface so I moved it here for the time being.

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