hevc/sao: use aligned copies
For band filter, source and destination are aligned (except for 16x16 ctbs), and otherwise, they are most often aligned. Overall, the total width is also too small for amortizing memcpy. Timings (using an intrinsic version of edge filters): B/32 B/64 E/32 E/64 Before: 32045 93952 38925 126896 After: 26772 83803 33942 117182
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