Commits on Jun 20, 2022

1. common/gossip_store: optimize case where entries are filtered out. …

   @whitslack complained of large CPU usage by connectd at startup;
   I ran perf record on connectd on my machine (which sees a little spike, only)
   and I see the cost of reading and discarding the entries:
   
   ```
   -   95.52%     5.24%  lightning_conne  lightning_connectd  [.] gossip_store_next
      - 90.28% gossip_store_next
         + 40.27% tal_alloc_arr_
         + 22.78% tal_free
         + 11.74% crc32c
         + 9.32% fromwire_peektype
         + 4.10% __libc_pread64 (inlined)
           1.70% be32_to_cpu
   ```
   
   Much of this is caused by the search for our own gossip: keeping this separately
   would be even better, but this fix is minimal.
   
   Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
   Changelog-Fixed: connectd: reduce initial CPU load when connecting to peers.

   

   rustyrussell committed Jun 20, 2022
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