refactor(compiler-core): simplify hoistStatic check for nodes without patchFlag

close #1912

packages/compiler-core/__tests__/transforms/__snapshots__/hoistStatic.spec.ts.snap

@@ -271,6 +271,22 @@ return function render(_ctx, _cache) {
 }"
 `;
 
+exports[`compiler: hoistStatic transform prefixIdentifiers should NOT hoist keyed template v-for with plain element child 1`] = `
+"const _Vue = Vue
+
+return function render(_ctx, _cache) {
+  with (_ctx) {
+    const { renderList: _renderList, Fragment: _Fragment, openBlock: _openBlock, createBlock: _createBlock, createVNode: _createVNode } = _Vue
+
+    return (_openBlock(), _createBlock(\\"div\\", null, [
+      (_openBlock(true), _createBlock(_Fragment, null, _renderList(items, (item) => {
+        return (_openBlock(), _createBlock(\\"span\\", { key: item }))
+      }), 128 /* KEYED_FRAGMENT */))
+    ]))
+  }
+}"
+`;
+
 exports[`compiler: hoistStatic transform should NOT hoist components 1`] = `
 "const _Vue = Vue
 

packages/compiler-core/__tests__/transforms/hoistStatic.spec.ts

@@ -600,5 +600,13 @@ describe('compiler: hoistStatic transform', () => {
         }).code
       ).toMatchSnapshot()
     })
+
+    test('should NOT hoist keyed template v-for with plain element child', () => {
+      const root = transformWithHoist(
+        `<div><template v-for="item in items" :key="item"><span/></template></div>`
+      )
+      expect(root.hoists.length).toBe(0)
+      expect(generate(root).code).toMatchSnapshot()
+    })
   })
 })