Ensure updates are applied when diffInCommitPhase is on

In this case there's no updatePayload.

Author: sebmarkbage

packages/react-dom/src/__tests__/ReactDOMFloat-test.js

@@ -7084,5 +7084,26 @@ background-color: green;
         </html>,
       );
     });
+
+    // @gate enableFloat
+    it('can update title tags', async () => {
+      const root = ReactDOMClient.createRoot(container);
+      await act(() => {
+        root.render(<title data-foo="foo">a title</title>);
+      });
+      await waitForAll([]);
+
+      expect(getMeaningfulChildren(document.head)).toEqual(
+        <title data-foo="foo">a title</title>,
+      );
+
+      await act(() => {
+        root.render(<title data-foo="bar">another title</title>);
+      });
+      await waitForAll([]);
+      expect(getMeaningfulChildren(document.head)).toEqual(
+        <title data-foo="bar">another title</title>,
+      );
+    });
   });
 });

packages/react-reconciler/src/ReactFiberCommitWork.js

@@ -2692,7 +2692,7 @@ function commitMutationEffectsOnFiber(
             const updatePayload: null | UpdatePayload =
               (finishedWork.updateQueue: any);
             finishedWork.updateQueue = null;
-            if (updatePayload !== null) {
+            if (updatePayload !== null || diffInCommitPhase) {
               try {
                 commitUpdate(
                   finishedWork.stateNode,