Fixes CfL for 4:4:4
Fixes CfL for 4:4:4

We shouldn't alias the CfL buffer for 4:4:4. This worked by accident when
Haar DC was added (and DCTs computed up-front), but even the original commit
that added the aliasing was broken for 4:4:4.

xiph/daala,HeadhunterXamd/daala,iankronquist/daala,felipebetancur/daala,luctrudeau/daala,vr000m/daala,HeadhunterXamd/daala,jmvalin/daala,kodabb/daala,vr000m/daala,jmvalin/daala,tribouille/daala,kustom666/daala,xiph/daala,vr000m/daala,nvoron23/daala,iankronquist/daala,KyleSiefring/daala,mbebenita/daala,kodabb/daala,nvoron23/daala,xiphmont/daala,KyleSiefring/daala,xiph/daala,felipebetancur/daala,HeadhunterXamd/daala,ycho/daala,ascent12/daala,ascent12/daala,luctrudeau/daala,nvoron23/daala,kodabb/daala,luctrudeau/daala,tribouille/daala,ycho/daala,jmvalin/daala,luctrudeau/daala,ascent12/daala,ascent12/daala,KyleSiefring/daala,mbebenita/daala,HeadhunterXamd/daala,xiph/daala,xiphmont/daala,tribouille/daala,nvoron23/daala,KyleSiefring/daala,kustom666/daala,KyleSiefring/daala,iankronquist/daala,mbebenita/daala,tribouille/daala,vr000m/daala,felipebetancur/daala,ascent12/daala,jmvalin/daala,ycho/daala,HeadhunterXamd/daala,iankronquist/daala,xiphmont/daala,vr000m/daala,ycho/daala,xiphmont/daala,luctrudeau/daala,felipebetancur/daala,mbebenita/daala,jmvalin/daala,nvoron23/daala,kodabb/daala,xiph/daala,kustom666/daala,tribouille/daala,ycho/daala,kustom666/daala,felipebetancur/daala,mbebenita/daala,kodabb/daala,kustom666/daala,xiphmont/daala,iankronquist/daala