Inconsistent output with weightp caused by f851138520c7 commit

[Mahesh Pittala]

Tested tip: 1.8+167-e951ab673b1c build info: [Windows][MSVC 1700][64 bit][CHECKED] 10bit First bad commit: f851138520c7

CLI: DucksAndLegs_1920x1080_60_10bit_422.yuv --no-info --hash=1 --psnr --ssim --input-res 1920x1080 --fps 60 --input-depth 10 --input-csp i422 -o out.hevc --preset medium

encoder log - http://pastie.org/10639272

[Mahesh Pittala]

Duplicate of #220.