polish(incremental): move check for empty state to end of batch

Reduces the number of times we need to check as to whether to flush the next queue.

Author: yaacovCR

src/execution/IncrementalGraph.ts

@@ -157,11 +157,6 @@ export class IncrementalGraph {
     subsequentResultRecord: SubsequentResultRecord,
   ): void {
     this._rootNodes.delete(subsequentResultRecord);
-    if (this._rootNodes.size === 0) {
-      for (const resolve of this._nextQueue) {
-        resolve({ value: undefined, done: true });
-      }
-    }
   }
 
   private _addIncrementalDataRecords(
@@ -336,6 +331,11 @@ export class IncrementalGraph {
     while ((completed = this._completedQueue.shift()) !== undefined) {
       yield completed;
     }
+    if (this._rootNodes.size === 0) {
+      for (const resolve of this._nextQueue) {
+        resolve({ value: undefined, done: true });
+      }
+    }
   }
 
   private _enqueue(completed: IncrementalDataRecordResult): void {