test/closed/compiler/6661918 fails with NullPointerException with DeoptimizeALot
(args: -Xcomp -XX:-PrintVMOptions -XX:CompileThreshold=100 -XX:+DeoptimizeALot -XX:-DoEscapeAnalysis -XX:DefaultMaxRAMFraction=8):

public final class DerivedClass /* extends Object */ {
}

    public static boolean run() {
        Object[][][][][] x = new Object[1][2][][][];
        x[0][0] = new DerivedClass[3][4][5]; <<<<<<<<<<< NullPointerException here !!!
        x[0][0][0][0][0] = new DerivedClass();

        return (x[0][0] instanceof DerivedClass[][][]);
    }

java.lang.NullPointerException
    at Test6661918.run(Test6661918.java:22)
    at Test6661918.main(Test6661918.java:12)