Remove mempool global from init

Can be reviewed with the git diff options

--color-moved=dimmed-zebra --color-moved-ws=ignore-all-space --ignore-all-space

src/validation.cpp

@@ -4227,6 +4227,14 @@ bool static LoadBlockIndexDB(ChainstateManager& chainman, const CChainParams& ch
     return true;
 }
 
+void CChainState::LoadMempool(const ArgsManager& args)
+{
+    if (args.GetArg("-persistmempool", DEFAULT_PERSIST_MEMPOOL)) {
+        ::LoadMempool(m_mempool);
+    }
+    m_mempool.SetIsLoaded(!ShutdownRequested());
+}
+
 bool CChainState::LoadChainTip(const CChainParams& chainparams)
 {
     AssertLockHeld(cs_main);