Make vp9_scale_and_extend_frame_ssse3 work for hbd when bitdepth = 8.
Only works for bitdepth = 8 when compiled with high bitdepth flag. 4x speed ups for handling 1:2 down/upsampling. Validated manually for: 1) Dynamic resize for a single layer encoding 2) SVC encoding with 3 spatial layers Results are bitexact with the patch and the speed gain (~4x) in the scaling was verified. BUG=webm:1371 Change-Id: I1bdb5f4d4bd0df67763fc271b6aa355e60f34712
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