Re: [w3c/ServiceWorker] Should importScripts() detect loops or otherwise abort after too much depth? (#1570)

This should be easier than the iframe case.  Iframes load asynchronously, but `importScripts()` is synchronous.  So we can keep a stack of currently loading scripts and just check if the current script is already loading once already.  If so, throw an exception as a loop was detected.

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