Disable upsampled references for resolutions above 1080p.
Upsampled references currently increase the size of references by 64 times. This patch limits the memory used by the encoder to about 3GB when encoding high bit depth content. This should be re-evaluated in the future, if doing 8-tap resampling in the motion search becomes reasonably fast, or if the upsampled references are reduced in size (by omitting some subpel positions and interpolating them instead). Change-Id: I6d84ff0d6202ec46f4fa53e268e68aa808e5df85
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