Reduce 2 iterators to one (backport #25973)

ledger/src/blockstore_processor.rs

@@ -320,14 +320,16 @@ fn execute_batches(
     timings: &mut ExecuteTimings,
     cost_capacity_meter: Arc<RwLock<BlockCostCapacityMeter>>,
 ) -> Result<()> {
-    let lock_results = batches
+    let (lock_results, sanitized_txs): (Vec<_>, Vec<_>) = batches
         .iter()
-        .flat_map(|batch| batch.lock_results().clone())
-        .collect::<Vec<_>>();
-    let sanitized_txs = batches
-        .iter()
-        .flat_map(|batch| batch.sanitized_transactions().to_vec())
-        .collect::<Vec<_>>();
+        .flat_map(|batch| {
+            batch
+                .lock_results()
+                .iter()
+                .cloned()
+                .zip(batch.sanitized_transactions().to_vec())
+        })
+        .unzip();
 
     let cost_model = CostModel::new();
     let mut minimal_tx_cost = u64::MAX;