Clean up vestige of useOpaqueIdentifier (#25587)

Found some code that was left over from the experimental
useOpaqueIdentifier hook, which we eventually replaced with useId.

This deletes it.

Author: acdlite

packages/react-reconciler/src/ReactFiberHooks.new.js

@@ -767,8 +767,6 @@ export function resetHooksAfterThrow(): void {
     hookTypesUpdateIndexDev = -1;
 
     currentHookNameInDev = null;
-
-    isUpdatingOpaqueValueInRenderPhase = false;
   }
 
   didScheduleRenderPhaseUpdateDuringThisPass = false;
@@ -2380,13 +2378,6 @@ function rerenderTransition(): [
   return [isPending, start];
 }
 
-let isUpdatingOpaqueValueInRenderPhase = false;
-export function getIsUpdatingOpaqueValueInRenderPhaseInDEV(): boolean | void {
-  if (__DEV__) {
-    return isUpdatingOpaqueValueInRenderPhase;
-  }
-}
-
 function mountId(): string {
   const hook = mountWorkInProgressHook();
 

packages/react-reconciler/src/ReactFiberHooks.old.js

@@ -767,8 +767,6 @@ export function resetHooksAfterThrow(): void {
     hookTypesUpdateIndexDev = -1;
 
     currentHookNameInDev = null;
-
-    isUpdatingOpaqueValueInRenderPhase = false;
   }
 
   didScheduleRenderPhaseUpdateDuringThisPass = false;
@@ -2380,13 +2378,6 @@ function rerenderTransition(): [
   return [isPending, start];
 }
 
-let isUpdatingOpaqueValueInRenderPhase = false;
-export function getIsUpdatingOpaqueValueInRenderPhaseInDEV(): boolean | void {
-  if (__DEV__) {
-    return isUpdatingOpaqueValueInRenderPhase;
-  }
-}
-
 function mountId(): string {
   const hook = mountWorkInProgressHook();
 

packages/react-reconciler/src/ReactFiberWorkLoop.new.js

@@ -205,7 +205,6 @@ import {resetContextDependencies} from './ReactFiberNewContext.new';
 import {
   resetHooksAfterThrow,
   ContextOnlyDispatcher,
-  getIsUpdatingOpaqueValueInRenderPhaseInDEV,
 } from './ReactFiberHooks.new';
 import {DefaultCacheDispatcher} from './ReactFiberCache.new';
 import {
@@ -3638,10 +3637,7 @@ if (__DEV__) {
 
 function warnAboutRenderPhaseUpdatesInDEV(fiber) {
   if (__DEV__) {
-    if (
-      ReactCurrentDebugFiberIsRenderingInDEV &&
-      !getIsUpdatingOpaqueValueInRenderPhaseInDEV()
-    ) {
+    if (ReactCurrentDebugFiberIsRenderingInDEV) {
       switch (fiber.tag) {
         case FunctionComponent:
         case ForwardRef:

packages/react-reconciler/src/ReactFiberWorkLoop.old.js

@@ -205,7 +205,6 @@ import {resetContextDependencies} from './ReactFiberNewContext.old';
 import {
   resetHooksAfterThrow,
   ContextOnlyDispatcher,
-  getIsUpdatingOpaqueValueInRenderPhaseInDEV,
 } from './ReactFiberHooks.old';
 import {DefaultCacheDispatcher} from './ReactFiberCache.old';
 import {
@@ -3638,10 +3637,7 @@ if (__DEV__) {
 
 function warnAboutRenderPhaseUpdatesInDEV(fiber) {
   if (__DEV__) {
-    if (
-      ReactCurrentDebugFiberIsRenderingInDEV &&
-      !getIsUpdatingOpaqueValueInRenderPhaseInDEV()
-    ) {
+    if (ReactCurrentDebugFiberIsRenderingInDEV) {
       switch (fiber.tag) {
         case FunctionComponent:
         case ForwardRef: