[llvm] [OFFLOAD] Update ffi_cif structure to match libffi (PR #128756)

[Joseph Huber via llvm-commits]

https://github.com/jhuber6 approved this pull request.

Thanks for fixing this, but I really wish we could delete this and resolve https://github.com/llvm/llvm-project/pull/91264. The confounding issue is the fact that the OpenMP implicit arguments are eagerly prepended instead of appended late.

https://github.com/llvm/llvm-project/pull/128756