Merge commit 'e5ffffe4'

* commit 'e5ffffe4':
  h264chroma: Remove duplicate 9/10 bit functions
  x86: Use simple nop codes for <= sse (rather than <= mmx)
  vp56: Remove clear_blocks call, and clear alpha plane U/V DC only
Merged-by: NMichael Niedermayer <michaelni@gmx.at>