[Openmp-commits] [openmp] [OpenMP] Add target to build OpenMP runtime (PR #189557)

[Robert Imschweiler via Openmp-commits]

https://github.com/ro-i approved this pull request.

I thought that we already had `libomp` because we have `check-libomp` (after cd'ing into `runtimes/runtimes-bins`).
In the longer run, it would be nice if we had more of a 1:1 mapping of build and `check-*` targets, where possible.

https://github.com/llvm/llvm-project/pull/189557