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

[Kevin Sala Penades via llvm-commits]

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kevinsala wrote:

```suggestion
  for (uint32_t I = 0; I < NumArgs; ++I) {
    Args[I] = reinterpret_cast<void *>(reinterpret_cast<intptr_t>(TgtArgs[I]) +
                                       TgtOffsets[I]);
    Ptrs[I] = &Args[I];
  }
```

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