29-105% faster apply_filter, 6-90% faster ape decoding on core2
(Any x86 other than core2 probably gets much less, since this is mostly due to ssse3 cachesplit avoidance and I haven't written the full gamut of other cachesplit modes.)
9-123% faster ape decoding on G4.



git-svn-id: file:///var/local/repositories/ffmpeg/trunk@20739 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b