clang

Add fliplr & flipud (#280) #581

Job	Run time
linux-x64-clang	7m 34s
linux-x64-clang-index	6m 23s
linux-x64-clang-generic-ndarray	17m 33s
linux-x64-clang-index	2m 46s
linux-x64-clang-no-stl	6m 25s
linux-x64-clang-no-stl-generic-ndarray-eval	6m 40s
linux-x64-clang-no-stl-generic-ndarray	14m 0s
linux-x64-clang-constexpr-eval	5m 22s
linux-x64-clang-constexpr-generic-ndarray-eval	9m 18s
linux-x64-clang-constexpr-no-stl-generic-ndarray-eval	7m 28s
linux-x64-clang-generic-ndarray-eval	8m 34s
	1h 32m 3s

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