refactor: align TxToUniv argument list with upstream

In bitcoin#20286, a new `TxToUniv` will be defined and in order to
minimize upstream deviation caused by having to change function calls
to account for `const CSpentIndexTxInfo*` being placed _before_
`const CTxUndo*` (requiring us to therefore specify `nullptr` as those
calls do not expect spend information) instead of letting the default
value remain. To allow for that, their ordering will be swapped.

To prevent a confusion with the last two arguments between the
`core_io` definition and the `rpc/blockchain` definition, let's do the
inversion here too before the backport.

src/core_io.h

@@ -47,6 +47,6 @@ std::string EncodeHexTx(const CTransaction& tx);
 std::string SighashToStr(unsigned char sighash_type);
 void ScriptPubKeyToUniv(const CScript& scriptPubKey, UniValue& out, bool fIncludeHex);
 void ScriptToUniv(const CScript& script, UniValue& out, bool include_address);
-void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry, bool include_hex = true, const CSpentIndexTxInfo* ptxSpentInfo = nullptr, const CTxUndo* txundo = nullptr);
+void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry, bool include_hex = true, const CTxUndo* txundo = nullptr, const CSpentIndexTxInfo* ptxSpentInfo = nullptr);
 
 #endif // BITCOIN_CORE_IO_H

src/core_write.cpp

@@ -192,7 +192,7 @@ void ScriptPubKeyToUniv(const CScript& scriptPubKey,
     out.pushKV("addresses", a);
 }
 
-void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry, bool include_hex, const CSpentIndexTxInfo* ptxSpentInfo, const CTxUndo* txundo)
+void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry, bool include_hex, const CTxUndo* txundo, const CSpentIndexTxInfo* ptxSpentInfo)
 {
     uint256 txid = tx.GetHash();
     entry.pushKV("txid", txid.GetHex());

src/rpc/blockchain.cpp

@@ -226,7 +226,7 @@ UniValue blockToJSON(const CBlock& block, const CBlockIndex* tip, const CBlockIn
             // coinbase transaction (i == 0) doesn't have undo data
             const CTxUndo* txundo = (have_undo && i) ? &blockUndo.vtxundo.at(i - 1) : nullptr;
             UniValue objTx(UniValue::VOBJ);
-            TxToUniv(*tx, uint256(), objTx, true, nullptr, txundo);
+            TxToUniv(*tx, uint256(), objTx, true, txundo);
             bool fLocked = isman.IsLocked(tx->GetHash());
             objTx.pushKV("instantlock", fLocked || result["chainlock"].get_bool());
             objTx.pushKV("instantlock_internal", fLocked);

src/rpc/rawtransaction.cpp

@@ -84,7 +84,7 @@ void TxToJSON(const CTransaction& tx, const uint256 hashBlock, CTxMemPool& mempo
         }
     }
 
-    TxToUniv(tx, uint256(), entry, true, &txSpentInfo);
+    TxToUniv(tx, uint256(), entry, true, /* txundo = */ nullptr, &txSpentInfo);
 
     bool chainLock = false;
     if (!hashBlock.IsNull()) {