019384f2d3
When we encode slide-show clips, for the majority of the time, only ZEROMV mode is checked, and all other modes are skipped. This change delayed uv intra-mode evaluation until intra mode is actually checked. This gave big performance gain for slide-show video encoding (2nd pass gain: 18% to 28%). But, this change doesn't help other types of videos. Also, zbin_mode_boost is adjusted in mode-checking loop, which causes bitstream mismatch before/after this change when --best or --good with --cpu-used=0 are used. Change-Id: I582b3e69fd384039994360e870e6e059c36a64cc