dirstate: add code to update the non-normal set
Before this patch, we were only populating the non-normal set when parsing
or packing the dirstate. This was not enough to keep the non-normal set up to
date at all time as we don't write and read the dirstate whenever a change
happens. This patch solves this issue by updating the non-normal set when it
should be updated. note: pack_dirstate changes the dmap and we have it keep
it unchanged for retrocompatibility so we are forced to recompute the
non-normal set after calling it.
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