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49e060bbcb
The watchdog (ipn/ipnlocal/watchdog.go) was abusing PeerForIP with an invalid netip.Addr as a way to acquire and release the engine's internal locks for deadlock detection. This does the TODO to break it out into its own method like all the other similarly named methods. Splitting this out as a prerequisite for a follow-up rewrite of PeerForIP itself; not having to preserve the lock-probe overload in the new implementation keeps that follow-up smaller. Updates #12542 Updates #cleanup Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: I25cbffd11aeb65600d9128845404c4918ef88ead