f3326b66bf8d77c19b5ca7ad70e536251c81cccb

When we compute descendent heads and descendent/ancestor tags, we cache the results. We need to be careful to invalidate the cache when we add stuff to the graph. Also make sure that when we cache descendent heads for a node we only cache the heads that are actually descendents of that node. Signed-off-by: Paul Mackerras <paulus@samba.org>
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