Closure compiler optimizations

gistfile1.js

// Original

var getElementsByTagName = "getElementsByTagName";

var links = document[getElementsByTagName]("link"),
    anchors = document[getElementsByTagName]("a"),
    iframeContents = "...<script>var whatever = document." + getElementsByTagName + "('whatever');</script>...";


// becomes

var a=document.getElementsByTagName("link"),b=document.getElementsByTagName("a"),c="...<script>var whatever = document.getElementsByTagName('whatever');</script>...";


// whereas, it could become

var a="getElementsByTagName",b=document[a]("link"),c=document[a]("a"),d="...<script>var whatever = document."+a+"('whatever');</script>...";


// Granted, I'm doing some code-golfing manually, which isn't a good thing. But the hope was to pass to the compiler some hints about how to optimize further.