VP5/6/8: add one inline missed in r24677
Originally committed as revision 24682 to svn://svn.ffmpeg.org/ffmpeg/trunk
Inline asm for VP56 arith coder
This is a lot more reliable to get cmov rather than trying to trick gcc intogenerating it, useful since it's 2% faster overall.
Patch by Eli Friedman <eli.friedman at gmail>
Originally committed as revision 24471 to svn://svn.ffmpeg.org/ffmpeg/trunk