Improve termination analysis - #273
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Improved (non)termination analysis. Instead of storing the current values of loop-modified variables in every iteration of the loop, non-deterministically decide whether to store or not, by adding a call to a
__INSTR_nondet_storefunction. Relies on PR staticafi/JetKlee#29. Update JetKlee after merging.Also fixes issue #268, where we marked some infeasible loops as non-terminating, because a failing assertion was inserted at the end of all predecessors of the loop header. Now it is only added to in-loop predecessors of the loop header, so the assertion is only visited if the loop was taken.