Fix VM snapshotting failures relating to OpenJDK MethodHandles

[ThanHenderson]

VM snapshotting is tested and functional (however limited) on JDK 8 and JDK 11 (both of which currently use OpenJ9 Method Handles (MH) by default). From JDK 17 and on, OpenJDK Method Handles are used by default.

I have seen an issue when testing on JDK 17+ where OpenJDK MH specific code is functioning incorrectly when snapshotting is enabled. Namely, addMemberNameToClass walks over J9Class::memberNames that consists of J9MemberNameListNodes. However, the J9MemberNameListNode::memberName is in an invalid state s.t. this line fails with a seg fault.

I think the MemberNames need to be added to the VM snapshot and/or fixed up when writing J9Classes to the snapshot, and handled appropriately on restore.