all: prefer new(big.Int) over big.NewInt(0) (#25087)

minor performance improvement: `big.NewInt(0).Xxx` -> `new(big.Int).Xxx`

cmd/devp2p/internal/ethtest/chain.go

@@ -47,7 +47,7 @@ func (c *Chain) Len() int {
 // TD calculates the total difficulty of the chain at the
 // chain head.
 func (c *Chain) TD() *big.Int {
-	sum := big.NewInt(0)
+	sum := new(big.Int)
 	for _, block := range c.blocks[:c.Len()] {
 		sum.Add(sum, block.Difficulty())
 	}
@@ -57,7 +57,7 @@ func (c *Chain) TD() *big.Int {
 // TotalDifficultyAt calculates the total difficulty of the chain
 // at the given block height.
 func (c *Chain) TotalDifficultyAt(height int) *big.Int {
-	sum := big.NewInt(0)
+	sum := new(big.Int)
 	if height >= c.Len() {
 		return sum
 	}

cmd/evm/internal/t8ntool/execution.go

@@ -241,7 +241,7 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 			minerReward.Add(minerReward, perOmmer)
 			// Add (8-delta)/8
 			reward := big.NewInt(8)
-			reward.Sub(reward, big.NewInt(0).SetUint64(ommer.Delta))
+			reward.Sub(reward, new(big.Int).SetUint64(ommer.Delta))
 			reward.Mul(reward, blockReward)
 			reward.Div(reward, big.NewInt(8))
 			statedb.AddBalance(ommer.Address, reward)