Brad Fitzpatrick 7fbbaff617 wgengine/magicsock: finish TODO to speed up peerMap.forEachEndpointWithDiscoKey
Now that peerMap tracks the set of nodes for a DiscoKey.

Updates #3088

Change-Id: I927bf2bdfd2b8126475f6b6acc44bc799fcb489f
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
(cherry picked from commit 7a243ae5b1968727e3f06ffd15c5c40ad8ab0026)
2021-10-19 12:18:17 -07:00
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