fix crash with sas=z3 and duplicate literals in split clauses #794
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Sometimes AVATAR derives a split clause like
17 | 17and then simplifies it to17. All well and good, but this messes up our proof printing because we assumed that all the SAT premises areFO_CONVERSIONSAT inferences, and17is aPROP_INF.We could also not simplify the clause in AVATAR. This might be nicer as there's already code to handle this ugly case elsewhere in
Splitterand I don't think the SAT/SMT solvers care. But this would be more invasive.