clang

Add more sycl tests (#262) #463

Job	Run time
linux-x64-clang	6m 37s
linux-x64-clang-constexpr-eval	4m 5s
linux-x64-clang-constexpr-generic-ndarray-eval	5m 53s
linux-x64-clang-constexpr-no-stl-generic-ndarray-eval	5m 18s
linux-x64-clang-index	3m 14s
linux-x64-clang-generic-ndarray	11m 20s
linux-x64-clang-generic-ndarray-eval	7m 19s
linux-x64-clang-index	1m 54s
linux-x64-clang-no-stl-generic-ndarray	9m 14s
linux-x64-clang-no-stl	4m 47s
linux-x64-clang-no-stl-generic-ndarray-eval	5m 58s
	1h 5m 39s

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