PVQ: Removes useless double-precision x[]
PVQ: Removes useless double-precision x[]

No change in metrics.

ycho/daala,HeadhunterXamd/daala,luctrudeau/daala,ycho/daala,luctrudeau/daala,HeadhunterXamd/daala,jmvalin/daala,luctrudeau/daala,xiphmont/daala,xiph/daala,xiph/daala,xiph/daala,xiphmont/daala,ycho/daala,luctrudeau/daala,HeadhunterXamd/daala,jmvalin/daala,luctrudeau/daala,ycho/daala,ycho/daala,jmvalin/daala,xiphmont/daala,jmvalin/daala,jmvalin/daala,HeadhunterXamd/daala,xiph/daala,HeadhunterXamd/daala,xiphmont/daala,xiphmont/daala,xiph/daala