[rcr] Re-export useMemoCache in top level React namespace

packages/react/index.development.js

@@ -30,6 +30,7 @@ export type ChildrenArray<+T> = $ReadOnlyArray<ChildrenArray<T>> | T;
 // We can't use export * from in Flow for some reason.
 export {
   __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
+  __COMPILER_RUNTIME,
   Children,
   Component,
   Fragment,

packages/react/index.experimental.development.js

@@ -9,6 +9,7 @@
 
 export {
   __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
+  __COMPILER_RUNTIME,
   Children,
   Component,
   Fragment,

packages/react/index.experimental.js

@@ -9,6 +9,7 @@
 
 export {
   __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
+  __COMPILER_RUNTIME,
   Children,
   Component,
   Fragment,

packages/react/index.fb.js

@@ -9,6 +9,7 @@
 
 export {
   __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
+  __COMPILER_RUNTIME,
   act,
   cache,
   Children,

packages/react/index.js

@@ -31,6 +31,7 @@ export type ChildrenArray<+T> = $ReadOnlyArray<ChildrenArray<T>> | T;
 // We can't use export * from in Flow for some reason.
 export {
   __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
+  __COMPILER_RUNTIME,
   Children,
   Component,
   Fragment,

packages/react/src/ReactClient.js

@@ -63,6 +63,7 @@ import ReactSharedInternals from './ReactSharedInternalsClient';
 import {startTransition} from './ReactStartTransition';
 import {act} from './ReactAct';
 import {captureOwnerStack} from './ReactOwnerStack';
+import ReactCompilerRuntime from './ReactCompilerRuntime';
 
 const Children = {
   map,
@@ -109,6 +110,7 @@ export {
   isValidElement,
   ReactVersion as version,
   ReactSharedInternals as __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
+  ReactCompilerRuntime as __COMPILER_RUNTIME,
   // Concurrent Mode
   useTransition,
   startTransition,

packages/react/src/ReactCompilerRuntime.js

@@ -0,0 +1,14 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+import {useMemoCache} from './ReactHooks';
+
+export default {
+  c: useMemoCache,
+};