Revert "core, txpool: less allocations when handling transactions (#21232)"

Reverting because this change started handling account balances as
uint64 in the transaction pool, which is incorrect.

This reverts commit af5c97aebe.

core/tx_list_test.go

@@ -17,6 +17,7 @@
 package core
 
 import (
+	"math/big"
 	"math/rand"
 	"testing"
 
@@ -50,22 +51,20 @@ func TestStrictTxListAdd(t *testing.T) {
 	}
 }
 
-func BenchmarkTxListAdd(b *testing.B) {
+func BenchmarkTxListAdd(t *testing.B) {
 	// Generate a list of transactions to insert
 	key, _ := crypto.GenerateKey()
 
-	txs := make(types.Transactions, 2000)
+	txs := make(types.Transactions, 100000)
 	for i := 0; i < len(txs); i++ {
 		txs[i] = transaction(uint64(i), 0, key)
 	}
 	// Insert the transactions in a random order
-	b.ResetTimer()
-	priceLimit := DefaultTxPoolConfig.PriceLimit
-	for i := 0; i < b.N; i++ {
-		list := newTxList(true)
-		for _, v := range rand.Perm(len(txs)) {
-			list.Add(txs[v], DefaultTxPoolConfig.PriceBump)
-			list.Filter(priceLimit, DefaultTxPoolConfig.PriceBump)
-		}
+	list := newTxList(true)
+	priceLimit := big.NewInt(int64(DefaultTxPoolConfig.PriceLimit))
+	t.ResetTimer()
+	for _, v := range rand.Perm(len(txs)) {
+		list.Add(txs[v], DefaultTxPoolConfig.PriceBump)
+		list.Filter(priceLimit, DefaultTxPoolConfig.PriceBump)
 	}
 }