Try optimizing f.mvs by only allocating when the length changes#1368

kkysen wants to merge 1 commit intomainmemorysafety/rav1d:mainfrom

kkysen/f-mvs-no-op-on-same-lenmemorysafety/rav1d:kkysen/f-mvs-no-op-on-same-lenCopy head branch name to clipboard