[llvm] [openmp] Reland: [OpenMP] Implement omp_get_uid_from_device() / omp_get_device_from_uid() (PR #168554)

[Michael Klemm via llvm-commits]

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mjklemm wrote:

This one was done as a temporary solution to avoid exposing the wrong symbols when using these functions from Fortran.  If these definitions would live in `kmp_ftn_entry.h`, the runtime would export Fortran symbols that implement an incorrect API w.r.t to OpenMP requirements.

https://github.com/llvm/llvm-project/pull/168554