[clang] [llvm] [openmp] [offload][OpenMP] Remove device code for num_threads strict (PR #157893)

[Robert Imschweiler via llvm-commits]

ro-i wrote:

No, there will be no `message` clause in the context of the target directive until I re-implement it. Is it important that it's a target directive? Otherwise, I could just remove the `target` and use the host `parallel` directive.

https://github.com/llvm/llvm-project/pull/157893