[FFmpeg-devel] [PATCH] Improve dnn_backend_native convolution speed

[Pedro Arthur]

The attached patch adds some specialized convolution functions based on the
filter size.

Benchmark (1190x670px image):
Filter        New        Old      Diff (%)
9x9x1x64 |  3.093662   5.135679   39.76%
1x1x64x32|  0.912451   5.670451   83.90%
5x5x32x1 |  0.502857   0.787371   36.13%
Total    |  4.51023    11.5954    61.10%
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