question: private void combineBlocks ( int alphaLabel , IntList betaLabels ) { int szBetas = betaLabels . size ( ) ; for ( int i = 0 ; i < szBetas ; i ++ ) { int betaLabel = betaLabels . get ( i ) ; BasicBlock bb = blocks . labelToBlock ( betaLabel ) ; IntList preds = ropMethod . labelToPredecessors ( bb . getLabel ( ) ) ; int szPreds = preds . size ( ) ; for ( int j = 0 ; j < szPreds ; j ++ ) { BasicBlock predBlock = newBlocks . labelToBlock ( preds . get ( j ) ) ; replaceSucc ( predBlock , betaLabel , alphaLabel ) ; } } }
target:  Combines blocks proven identical into one alpha block, re-writing all of the successor links that point to the beta blocks to point to the alpha block instead.