Merge #19705: Shrink CAddress from 48 to 40 bytes on x64

767073f Shrink CAddress from 48 to 40 bytes on x64 (Vasil Dimov)

Pull request description:

  `CAddress` inherits `CService` which is 28 bytes (on 64 bit machines).
  `CAddress` then adds two member variables - one that requires 4 byte
  alignment (`nTime`) and one that requires 8 byte alignment
  (`nServices`).

  Declare the smaller one first so that it fits in bytes 29..32.

  On 32 bit machines this change has no effect and `CAddress` remains 40
  bytes.

ACKs for top commit:
  laanwj:
    ACK 767073f
  theStack:
    ACK bitcoin/bitcoin@767073f

Tree-SHA512: 73d6a4fcfa2687b4076950801871252e369510ecf09f820576dbeca9ee3ee94d14672e7d5596cb45fedd9e4b973dd0716a2ea3f13fc3058b4b697d036a7c9db0

Author: laanwj

src/protocol.h

@@ -374,9 +374,10 @@ class CAddress : public CService
         READWRITEAS(CService, obj);
     }
 
-    ServiceFlags nServices{NODE_NONE};
     // disk and network only
     uint32_t nTime{TIME_INIT};
+
+    ServiceFlags nServices{NODE_NONE};
 };
 
 /** getdata message type flags */