Optimize ctx calculation in decode_cabac_mb_mvd(), code by dark shikari.
The case for 16x16 blocks becomes 10 cpu cycles faster on pentium dual, i could not find a speed difference in the case of subblocks though. git-svn-id: file:///var/local/repositories/ffmpeg/trunk@16226 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b
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