refactor(runtime-core): adjust attr fallthrough behavior

BREAKING CHANGE: adjust attr fallthrough behavior

    Updated per pending RFC https://github.com/vuejs/rfcs/pull/137

    - Implicit fallthrough now by default only applies for a whitelist
      of attributes (class, style, event listeners, a11y attributes, and
      data attributes).

    - Fallthrough is now applied regardless of whether the component has
      explicitly declared props. (close #749)

packages/runtime-core/src/componentProps.ts

@@ -214,7 +214,7 @@ export function resolveProps(
   lock()
 
   instance.props = props
-  instance.attrs = options ? attrs || EMPTY_OBJ : props
+  instance.attrs = attrs || EMPTY_OBJ
   instance.vnodeHooks = vnodeHooks || EMPTY_OBJ
 }