Change to use unaligned load
Change to use unaligned load

BUG=aomedia:496

Change-Id: Ib49a34233b538c7543425acab305e9bc4ffcfea0

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