Revert "update hideOrUnhideAllChildren to hide portals that aren't wrapped in a host component (#16992)" (#17011)

This reverts commit de2edc268d.

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

@@ -104,29 +104,6 @@ describe('ReactDOMSuspensePlaceholder', () => {
     expect(window.getComputedStyle(divs[2].current).display).toEqual('inline');
   });
 
-  it('hides and unhides child portals', async () => {
-    const portalContainer = document.createElement('div');
-    function Component() {
-      return ReactDOM.createPortal(<span />, portalContainer);
-    }
-
-    function App() {
-      return (
-        <Suspense fallback={<Text text="Loading..." />}>
-          <AsyncText ms={500} text="A" />
-          <Component />
-        </Suspense>
-      );
-    }
-
-    ReactDOM.render(<App />, container);
-    expect(window.getComputedStyle(portalContainer).display).toEqual('none');
-
-    await advanceTimers(500);
-    Scheduler.unstable_flushAll();
-    expect(window.getComputedStyle(portalContainer).display).toEqual('block');
-  });
-
   it('hides and unhides timed out text nodes', async () => {
     function App() {
       return (

packages/react-reconciler/src/ReactFiberCommitWork.js

@@ -645,13 +645,6 @@ function hideOrUnhideAllChildren(finishedWork, isHidden) {
         } else {
           unhideInstance(node.stateNode, node.memoizedProps);
         }
-      } else if (node.tag === HostPortal) {
-        const instance = node.stateNode.containerInfo;
-        if (isHidden) {
-          hideInstance(instance);
-        } else {
-          unhideInstance(instance, node.memoizedProps);
-        }
       } else if (node.tag === HostText) {
         const instance = node.stateNode;
         if (isHidden) {