fix merge

Author: lukesandberg

turbopack/crates/turbo-tasks-backend/src/backend/mod.rs

@@ -239,7 +239,6 @@ impl<B: BackingStorage> TurboTasksBackendInner<B> {
             storage: Storage::new(shard_amount, small_preallocation),
             snapshot_coord: SnapshotCoordinator::new(),
             snapshot_in_progress: Mutex::new(()),
-            last_snapshot: AtomicU64::new(0),
             stopping: AtomicBool::new(false),
             stopping_event: Event::new(|| || "TurboTasksBackend::stopping_event".to_string()),
             idle_start_event: Event::new(|| || "TurboTasksBackend::idle_start_event".to_string()),