Improve performance of horizontal loop filtering #151
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Tried to implement the recommended changes in #136 by splitting out the vertical and horizontal loop filters, not totally sure what else I should be doing but these changes seem to help a bit from the benchmarks I added.
Improvements ranged from ~5-40% from before to after, the better improvements were on the horizontal filters (which makes sense).
Also cleaned up the comments a little, wondering if there's anything more we could do to improve
loop_filter::should_filter