[1.3] Disable test not supported by SYCL #2469
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SimeonEhrig
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Backport #2468.
According to the documentation of the SYCL Group functions 1 and SYCL Group algorithms library 2, calling
sycl::all_of_groupwith some threads having exited the kernel is undefined behaviour. This was confirmed during a support meeting with Intel.oneAPI has an extension to support non-uniform (sub)groups: sycl_ext_oneapi_non_uniform_groups.
The implementation of the SYCL warp functions should be extended using it; until then, we disable the failing test when using a SYCL back-end and instead print an informational message.