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arm: looprestoration: NEON optimized wiener filter

Martin Storsjö requested to merge mstorsjo/dav1d:arm-wiener into master

The relative speedup compared to C code is around 4-8x:

                    Cortex A7     A8     A9    A53    A72    A73
wiener_luma_8bpc_neon:   4.00   7.54   4.74   6.84   4.91   8.01
Edited by Martin Storsjö

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