James Tucker b3c3a9f174 syncs: add Map.Len to get the length of the Map
I need this for a corp change where I have a set as a queue, and make a
different decisison if the set is empty.

Updates tailscale/corp#10344

Signed-off-by: James Tucker <james@tailscale.com>
2023-04-27 19:10:28 -07:00
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