move-only: make GetInfo a private CTxMemPool member

This allows it to be used by templated functions in a future commit.

src/txmempool.cpp

@@ -844,10 +844,6 @@ std::vector<CTxMemPool::indexed_transaction_set::const_iterator> CTxMemPool::Get
     return iters;
 }
 
-static TxMempoolInfo GetInfo(CTxMemPool::indexed_transaction_set::const_iterator it) {
-    return TxMempoolInfo{it->GetSharedTx(), it->GetTime(), it->GetFee(), it->GetTxSize(), it->GetModifiedFee() - it->GetFee()};
-}
-
 std::vector<CTxMemPoolEntryRef> CTxMemPool::entryAll() const
 {
     AssertLockHeld(cs);

src/txmempool.h

@@ -431,6 +431,11 @@ private:
                                                               const Limits& limits
                                                               ) const EXCLUSIVE_LOCKS_REQUIRED(cs);
 
+    static TxMempoolInfo GetInfo(CTxMemPool::indexed_transaction_set::const_iterator it)
+    {
+        return TxMempoolInfo{it->GetSharedTx(), it->GetTime(), it->GetFee(), it->GetTxSize(), it->GetModifiedFee() - it->GetFee()};
+    }
+
 public:
     indirectmap<COutPoint, const CTransaction*> mapNextTx GUARDED_BY(cs);
     std::map<uint256, CAmount> mapDeltas GUARDED_BY(cs);