[Openmp-dev] OpenMP defines __CUDA_ARCH__ for offloading, should it?

[Jon Chesterfield via Openmp-dev]

Discovered by accident while looking into a bug for Ron (cc'd).

OpenMP running on nvptx defines the __CUDA_ARCH__ macro. Do we think it
should? OpenMP target offloading is somewhat implemented in terms of cuda
but that seems incidental.

I'd like a __GPU_ARCH__ macro which expands to something useful for nvptx,
amdgcn, other. And to not define CUDA_ARCH when compiling openmp offloading
code.

Thoughts?

Jon
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