TLDR: If `this` is used without `super` (which should be statically
analyzable), let it refer to Object.create(new.target.prototype). Otherwise,
let super creates what it refers to.
I know the reason to force `super` in derived class's constructor is to make
sure `this` refers to the exotic object the base class might allocate.
But I bet in real world, extending base classes who only create ordinary
objects is more common than extending those create exotic objects. And forget
to call super is going to be frequent mistake. In es5, when you extend a class
like this
```js
function Foo() {
Bar.call(this)
}
Foo.prototype = Object.create(Bar.prototype);
```
`this` refers to Object.create(new.target.prototype). So I wonder if we can
keep this behavior, making things less surprising when people transit to es
2015?
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