[llvm] [llvm] Pass FFI CMake options through to runtimes (for offload) (PR #118807)

[Joseph Huber via llvm-commits]

jhuber6 wrote:

I hate the fact that we use FFI at all. I once had a patch to try to get rid of it https://github.com/llvm/llvm-project/pull/91264, but it ran into issues with the way Johannes routed 'implicit' arguments into the OpenMP kernels. I don't remember what they're used for, but they're put at the beginning of the buffer so it's impossible to optimize them out / ignore them.

https://github.com/llvm/llvm-project/pull/118807