According to Microsoft’s docs, the syntax for revealing and hiding content using conditional comments are different, so since you’re trying to only use (reveal) the script for IE8 and below (vs. hiding it), the echo statement should change to:
echo '<![if lt IE 9]><script src="https://html5shiv.googlecode.com/svn/trunk/html5.js"></script><![endif]>' . "\n";
Support for conditional comments ended with IE10, so it may also be that the IE8 Compatibility View doesn’t actually render the page with the old engine that supports CCs.
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