Re: [w3c/webcomponents] Why does upgrade-an-element queue attribute, connected reactions before exiting early? (#523)

FYI, double-queueing upgrade reactions could also happen in fragment parser. [Create an element](https://dom.spec.whatwg.org/#concept-create-element) enqueues upgrade reactions for fragment parser where sync flag is unset. Then [inserting the node](https://dom.spec.whatwg.org/#concept-node-insert) tries to upgrade before the upgrade is invoked, which enqueues again.

We found innerHTML setter test case hits this.

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