Commits on Jan 26, 2023

1. kv: remove lastToReplica and lastFromReplica from raftMu …

   In 410ef29, we moved these fields from under the Replica.mu to under the
   Replica.raftMu. This was done to avoid lock contention.
   
   In this commit, we move these fields under their own mutex so that they
   can be accessed without holding the raftMu. This allows us to send Raft
   messages from other goroutines.
   
   The commit also switches from calling RawNode.ReportUnreachable directly
   in sendRaftMessage to using the more flexible unreachablesMu set, which
   defers the call to ReportUnreachable until the next Raft tick. As a result,
   the commit closes cockroachdb#84246.
   
   Release note: None
   Epic: None

   

   nvanbenschoten committed Jan 26, 2023
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