Make assumption functions in new solver take Binder<'tcx, Clause<'tcx>>
          #112665
        
          
      
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We just use an if-let to match on an optional clause at all the places where we transition from
Predicate->Clause, but I assume that when things like item-bounds and param-env start to only storeClauses then those can just be trivially dropped.r? @lcnr