Dynamically imported modules are sorted before any other entry since #295.

Let's assume an entry point main.js:

 import './styles.css'
 import('./dynamic.js').then(...)

and a dynamically imported module dynamic.js:

import './dynamic-styles.css`

Before #295 the css bundle had styles.css content before dynamic-styles.css content. Now the order is inverted.

The moduleIds array returned from getRecursiveImportOrder is missing the module ids found by using getModuleInfo(id).dynamicallyImportedIds. The previous definition based on this.moduleIds had them.

Dynamically imported modules should also have a stable order among themselves.

@wardpeet can I ask for your help?