Not benchmarked as this is petty much just code removial.

Originally committed as revision 22066 to svn://svn.ffmpeg.org/ffmpeg/trunk

ones based on mb_stride in h264.
about 20 cpu cycles faster overall per MB

Originally committed as revision 22065 to svn://svn.ffmpeg.org/ffmpeg/trunk

This eliminates all aliasing violation warnings in h264 code.
No measurable speed difference with gcc-4.4.3 on i7.

Originally committed as revision 21881 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21314 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21313 to svn://svn.ffmpeg.org/ffmpeg/trunk

Thats not possible except maybe in FMO which noone uses anyway.
iam also not sure if this wasnt missing a part_width.

Originally committed as revision 21312 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21220 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21174 to svn://svn.ffmpeg.org/ffmpeg/trunk