[apparmor] [PATCH] Fix expr tree node labeling

[John Johansen]

expression tree node labeling is used during debugging dumps.  Currently the node labels
are computed and stored in a map, that is not cleaned up.  This means that the labeling
is retained across different dfas.

Move the labeling into expr node as this takes less memory than using a map and will
also separates node labeling so its per dfa instead of global.  In addition this means
the labeling is cleanedup/freed when the expr tree is freed without any extra work.
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