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Hopefully someone comes along with a more in depth answer but when I've received weird error messages like this I typically comment parts of my kernel out until I can isolate the line(s) of code that cause the error. Once you know the code or code style that is causing issues you can typically refactor it to be more compiler friendly.
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To be honest this is the best way to answer this question.
When it comes to such compiler crashes, there is neither a fixed pattern to why it crashes crash, nor a fixed pattern as to how it can be fixed/avoided, and there are A LOT of such crashes. These problems should be fixed by Altera since nobody else has access to the compiler's source code, and you can always open a ticket with Altera and report the problem; however, by the time the issue is confirmed and then fixed (if they opt to fix it), it will probably take a couple of months which is not a viable waiting time for most people. At the end of the day, refactoring the code to bypass the crash is probably the fastest solution.
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