Merge pull request vuejs#314 from F-loat/fix-registe-ref

fix: vuejs#149 恢复对组件 ref 的支持

Author: anchengjian

src/platforms/mp/runtime/patch.js

@@ -3,14 +3,16 @@
 import * as nodeOps from './node-ops'
 import { createPatchFunction } from 'core/vdom/patch'
 // import baseModules from 'core/vdom/modules/index'
+import ref from 'core/vdom/modules/ref'
 // const platformModules = []
 // import platformModules from 'web/runtime/modules/index'
 
 // the directive module should be applied last, after all
 // built-in modules have been applied.
 // const modules = platformModules.concat(baseModules)
+const modules = [ref]
 
-export const corePatch: Function = createPatchFunction({ nodeOps, modules: [] })
+export const corePatch: Function = createPatchFunction({ nodeOps, modules })
 
 export function patch () {
   corePatch.apply(this, arguments)