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Implements the OpenCL side of #1602 (no CUDA support) and validates with clang. #1602 is pretty old so I'm curious if there's still interest in this, but I need OpenCL/CUDA and support for legacy reasons. While this backend is smaller due to being compute only, it requires some changes in spirv_glsl to deal with OpenCL being a C-based language. The tests have mostly been copied from MSL, with more tests to cover subgroup emulation. Nvidia and AMD never fully implemented the subgroup extensions this more complicated emulation is necessary.
Please let me know if you think this would be a useful backend and if you have any thoughts about the design. I'm looking at CUDA as well.