unbreak infinite recursion check for fromfile() & co.
i broke this by switching to using a separate evaluator. the new
evaluator has an empty file stack, so the check would be pointless.
fix it by recoding and traversing the call chain.
Change-Id: Icb1f19adc6e66a865cd5be78eeb1c10072b4f8fc
Reviewed-by:
Daniel Teske <daniel.teske@nokia.com>
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