Replace /2 by >>1 in decode_cabac_mb_dqp() 3 cpu cycles speed up on pentium dual.
Replace /2 by >>1 in decode_cabac_mb_dqp()
3 cpu cycles speed up on pentium dual.


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@16233 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg