Fix PCall.forceSubstitution#865
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If one calls
forceSubstitutionon annestedPCallexpression, we would get2^ncalls toforceSubstitutionsince eachPCallwould callforceSubstitutionon its children twice. See the attached Viper file for an example where this results in non-termination of typechecking (rename to.vprafter downloading).program-check.txt