Re: [w3c/webcomponents] Unexpected upgrade timing when appending an element and script together (#606)

Here's another interesting case:
```
.<script>
customElements.define("h-i", class HI extends HTMLElement {
  connectedCallback() { w("HI is connected") }
});
df = document.createDocumentFragment();
s1 = df.appendChild(document.createElement("script")); 
s1.textContent = "w('s1 executed');";
df.appendChild(document.createElement("h-i"));
s2 = df.appendChild(document.createElement("script")); 
s2.textContent = "w('s2 executed');";
document.head.appendChild(df);
</script>
```
Currently the order is s1, s2, HI. I guess with the proposed change it'd be HI, s1, s2? Or if we introduce a "script queue" concept as per https://github.com/whatwg/dom/pull/576 could we reuse that for custom element reactions and make it s1, HI, s2?

And what is preferred for this scenario?

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