Re-factor and simplify arnr filter.
Use a weaker filter for second level arf frames. Average gain across all sets and metrics ~0.3% Remove code for arnr_type which is no longer supported in VP9 which always uses a centered blur. Re-factor and some cleanup. Change-Id: Ieb4b8940e99e4e02b3fcc9fca6f2d4109e6ed639
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