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Add U64x8::sum8_u8_add_masked, a vertical masked byte sum #256

Job	Run time
realization/avx512 × x86_64	1m 58s
realization/avx2 × x86_64	2m 23s
realization/v2 × x86_64	3m 21s
realization/neon × aarch64	3m 6s
realization/host-native × x86_64 (informational)	1m 28s
cpu_guard × library host	1m 50s
realization/avx × x86_64	3m 47s
realization/nightly × x86_64	2m 12s
realization/wasm + scalar × wasm32	2m 34s
	22m 39s