loopfilter _6 vertical improvement
loopfilter _6 vertical improvement

loopfilter _6 vertical 1.5 speed improvement

Change-Id: I629cf2969a9d7dca6494d02ba7674ad5748a1fa2

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom