speedup random forest getVotes method. #3782
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Port of opencv/opencv#26046
Speedup
DTreesImplForRTrees::getVotesmethod in about x2 times.Matobjects are usually not expensive for creation or copying. But if algorithm itself is fast, operations onMatobjects start to take significant time. Naive extraction of loop invariant temporaryMatwrapper object creation allows to decreasegetVotesmethod run time in about x2 times.