+ Removed unused code
  + Optimized mc chroma 4xH and satd 8x4 and 4x8
  + Won a bunch of cycles by not trusting gcc about inlining and
    unrolling properly
 (about 17% faster globally)


git-svn-id: svn://svn.videolan.org/x264/trunk@224 df754926-b1dd-0310-bc7b-ec298dee348c