Make fn:invisible-xml parser interruptible - #2767
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As reported in #2763, an ambiguous ixml grammar can grow the parse forest until OOM without being stoppable:
xquery:eval'stimeoutandmemorylimits never fire, because the parse loop does not take notice of thestoppedcondition.Markup Blitz 1.13 now has a checkpoint-aware
parse. Passingqc::checkStopto it makes these limits work.