SimSYCL
                                
                                
                                
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                        SYCL_KHR_GROUP_INTERFACE prototype
This is a prototype implementation of the SYCL_KHR_GROUP_INTERFACE extension. https://github.com/KhronosGroup/SYCL-Docs/pull/638
The C++23-exclusive features are not implemented as of yet, but the rest should be feature complete.
Tests are adapted from the CTS.