Ignore class loading errors in LoadableDescriptors

[theresa-m]

Ignore ClassCircularityError created by LoadableDescriptors lists. I encountered this error when trying to enable migrated value classes #20386

Related to #19119

class Test {
        public static void main(String[] args) throws Throwable {
                Circ c = new Circ();
        }
}

value class Circ {
        static Circ2 c2;
        /* LoadableDescriptors list contains Circ2 */
}

value class Circ2 {
        static Circ c;
        /* LoadableDescriptors list contains Circ */
}

[hangshao0]

Jenkins test sanity.functional,extended plinuxval jdknext

[hangshao0]

LGTM.