Remove unused import.

Author: cstancu

substratevm/src/com.oracle.graal.pointsto/src/com/oracle/graal/pointsto/typestate/PointsToStats.java

@@ -32,7 +32,6 @@
 import java.nio.file.Path;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
-import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
 import java.util.Map.Entry;