Refactored 4x4 intra prediction to use common multiplication function
Refactored 4x4 intra prediction to use common multiplication function

tribouille/daala,jmvalin/daala,iankronquist/daala,luctrudeau/daala,tdaede/daala,xiph/daala,ycho/daala,xiphmont/daala,ekr/daala,kustom666/daala,xiphmont/daala,jmvalin/daala,ycho/daala,metajack/daala,smarter/daala,xiphmont/daala,iankronquist/daala,KyleSiefring/daala,felipebetancur/daala,tribouille/daala,mbebenita/daala,metajack/daala,kbara/daala,tribouille/daala,felipebetancur/daala,jmvalin/daala,kbara/daala,tdaede/daala_awcy_runs,ekr/daala,xiph/daala,smarter/daala,xiph/daala,tdaede/daala_awcy_runs,felipebetancur/daala,KyleSiefring/daala,kustom666/daala,HeadhunterXamd/daala,KyleSiefring/daala,vr000m/daala,luctrudeau/daala,mbebenita/daala,tdaede/daala,kodabb/daala,felipebetancur/daala,mbebenita/daala,ascent12/daala,luctrudeau/daala,xiphmont/daala,kodabb/daala,kodabb/daala,felipebetancur/daala,tdaede/daala,nvoron23/daala,vr000m/daala,fluffy/daala,HeadhunterXamd/daala,HeadhunterXamd/daala,iankronquist/daala,nvoron23/daala,nvoron23/daala,smarter/daala,luctrudeau/daala,kodabb/daala,mbebenita/daala,vr000m/daala,kustom666/daala,iankronquist/daala,ascent12/daala,kodabb/daala,metajack/daala,fluffy/daala,nvoron23/daala,xiph/daala,vr000m/daala,tribouille/daala,ycho/daala,smarter/daala,xiph/daala,iankronquist/daala,fluffy/daala,tribouille/daala,kustom666/daala,ascent12/daala,KyleSiefring/daala,tdaede/daala_awcy_runs,luctrudeau/daala,kbara/daala,xiphmont/daala,ekr/daala,jmvalin/daala,tdaede/daala_awcy_runs,jmvalin/daala,KyleSiefring/daala,tdaede/daala,HeadhunterXamd/daala,HeadhunterXamd/daala,vr000m/daala,ycho/daala,ascent12/daala,ascent12/daala,ycho/daala,mbebenita/daala,kustom666/daala,kbara/daala,nvoron23/daala