[libc] [llvm] [OpenMP] Build OpenMP DeviceRTL on SPIR-V (PR #121600)

[Joseph Huber via llvm-commits]

jhuber6 wrote:

Unsure, I might just remove `-fopenmp` from the DeviceRTL while I'm at it, but I don't know how SPIRV will handle that since it works fine for AMD / NVIDIA.

https://github.com/llvm/llvm-project/pull/121600