8215575: C2 crash: assert(get_instanceKlass()->is_loaded()) failed: must be at least loaded Summary: Set InstanceKlass::loaded before adding classes to the subklass list, which can be read concurrently by the compiler. Reviewed-by: dholmes, eosterlund

8215510: j.l.c.ClassDesc is accepting descriptors not allowed by the spec Reviewed-by: goetz

8215708: ZGC: Add missing LoadBarrierNode::size_of() Reviewed-by: eosterlund, neliasso