fix(compiler-core): avoid generating useless createVNode helper (#2938)

close #2739

packages/compiler-core/src/transforms/hoistStatic.ts

@@ -14,7 +14,7 @@ import {
 import { TransformContext } from '../transform'
 import { PatchFlags, isString, isSymbol } from '@vue/shared'
 import { isSlotOutlet } from '../utils'
-import { CREATE_VNODE } from '../runtimeHelpers'
+import { CREATE_BLOCK, CREATE_VNODE, OPEN_BLOCK } from '../runtimeHelpers'
 
 export function hoistStatic(root: RootNode, context: TransformContext) {
   walk(
@@ -212,6 +212,8 @@ export function getConstantType(
         // static then they don't need to be blocks since there will be no
         // nested updates.
         if (codegenNode.isBlock) {
+          context.removeHelper(OPEN_BLOCK)
+          context.removeHelper(CREATE_BLOCK)
           codegenNode.isBlock = false
           context.helper(CREATE_VNODE)
         }