[OpenMP][Offload] Add SPMD-No-Loop mode to OpenMP offload runtime (#154105)
Kernels which are marked as SPMD-No-Loop should be launched with
sufficient number of teams and threads to cover loop iteration space.
No-Loop mode is described in RFC:
https://discourse.llvm.org/t/rfc-no-loop-mode-for-openmp-gpu-kernels/87517/