fix(reactivity): revert computed scheduler change

fix #4157

packages/runtime-core/__tests__/rendererComponent.spec.ts

@@ -10,8 +10,7 @@ import {
   inject,
   Ref,
   watch,
-  SetupContext,
-  computed
+  SetupContext
 } from '@vue/runtime-test'
 
 describe('renderer: component', () => {
@@ -325,36 +324,4 @@ describe('renderer: component', () => {
     expect(serializeInner(root)).toBe(``)
     expect(ids).toEqual([ids[0], ids[0] + 1, ids[0] + 2])
   })
-
-  test('computed that did not change should not trigger re-render', async () => {
-    const src = ref(0)
-    const c = computed(() => src.value % 2)
-    const spy = jest.fn()
-    const App = {
-      render() {
-        spy()
-        return c.value
-      }
-    }
-
-    const root = nodeOps.createElement('div')
-    render(h(App), root)
-    expect(serializeInner(root)).toBe(`0`)
-    expect(spy).toHaveBeenCalledTimes(1)
-
-    // verify it updates
-    src.value = 1
-    src.value = 2
-    src.value = 3
-    await nextTick()
-    expect(serializeInner(root)).toBe(`1`)
-    expect(spy).toHaveBeenCalledTimes(2) // should only update once
-
-    // verify it updates
-    src.value = 4
-    src.value = 5
-    await nextTick()
-    expect(serializeInner(root)).toBe(`1`)
-    expect(spy).toHaveBeenCalledTimes(2) // should not need to update
-  })
 })

packages/runtime-core/src/scheduler.ts

@@ -2,10 +2,6 @@ import { ErrorCodes, callWithErrorHandling } from './errorHandling'
 import { isArray } from '@vue/shared'
 import { ComponentInternalInstance, getComponentName } from './component'
 import { warn } from './warning'
-import { setComputedScheduler } from '@vue/reactivity'
-
-// set scheduler for computed
-setComputedScheduler(queueJob)
 
 export interface SchedulerJob extends Function {
   id?: number