Don't use compound prediction for golden frames based on alt-ref frames.
These frames can force reference frame (arf), mode (zeromv) and skip, which means that if we use compound prediction (i.e. arf+last), we might use a blend of a perfect (arf) and an imperfect (last) predictor, leading to semi-garbage display and thus a huge drop in SSIM/PSNR (up to 10dB for some frames I analyzed). Gives a +0.2% gain on YT. Change-Id: If1f2b7899ad165684af3808fd379295e82558cbb
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