Merge bitcoin/bitcoin#23970: Remove pointless and confusing shift in RelayAddress

fa9f4554ca refactor: Remove pointless and confusing shift in RelayAddress (MarcoFalke)

Pull request description:

  The second argument written to the siphash is already quantized to 24 hours, so it seems confusing to quantize the first argument to 32 bits (out of 64 bits).

  > The shifting is pointless, we should get rid of it. It seems to be a silly evolution of this 2010 Satoshi code: 5cbf753 (where it made sense because everything was XORed together, and the address used the high bits, while the time used the low ones).

  (Copied from https://github.com/bitcoin/bitcoin/pull/18642#issuecomment-613773120)

  (The original code was `uint256 hashRand = hashSalt ^ (((int64)addr.ip)<<32) ^ ((GetTime()+addr.ip)/(24*60*60));`)

  This also allows to remove a integer sanitizer suppression for the whole file.

ACKs for top commit:
  laanwj:
    Code review ACK fa9f4554ca
  sipa:
    utACK fa9f4554ca
  promag:
    Code review ACK fa9f4554ca.

Tree-SHA512: f5fd107464ccd839d6749aed6914b4935e39ab42906546b3f3810a7339fc4633fef931a1783a287572af5ec64525626fa91d147d8ff52eb076740465bf5cf839

src/net_processing.cpp

@@ -1746,8 +1746,8 @@ void PeerManagerImpl::RelayAddress(NodeId originator,
     // Relay to a limited number of other nodes
     // Use deterministic randomness to send to the same nodes for 24 hours
     // at a time so the m_addr_knowns of the chosen nodes prevent repeats
-    uint64_t hashAddr = addr.GetHash();
-    const CSipHasher hasher = m_connman.GetDeterministicRandomizer(RANDOMIZER_ID_ADDRESS_RELAY).Write(hashAddr << 32).Write((GetTime() + hashAddr) / (24 * 60 * 60));
+    const uint64_t hashAddr{addr.GetHash()};
+    const CSipHasher hasher{m_connman.GetDeterministicRandomizer(RANDOMIZER_ID_ADDRESS_RELAY).Write(hashAddr).Write((GetTime() + hashAddr) / (24 * 60 * 60))};
     FastRandomContext insecure_rand;
 
     // Relay reachable addresses to 2 peers. Unreachable addresses are relayed randomly to 1 or 2 peers.

test/sanitizer_suppressions/ubsan

@@ -105,6 +105,5 @@ implicit-unsigned-integer-truncation:crypto/
 shift-base:arith_uint256.cpp
 shift-base:crypto/
 shift-base:hash.cpp
-shift-base:net_processing.cpp
 shift-base:streams.h
 shift-base:util/bip32.cpp