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63e9d059c8
Added a list of links for vm objects so they can follow the links that point at them. More succinct handling of the case where a vm object is dropped. Now depending on the object's number of link references and shadow references, upon a drop it could either be merged, deleted or kept. Added opener reference count for vm files. Now files have opener count, objects have shadow and link count. Link count is also meaningful for how many tasks have mmap'ed that object.