Extension to interpreter class

Author: thk123

src/goto-programs/interpreter_class.h

@@ -85,6 +85,7 @@ class interpretert:public messaget
     irep_idt calling_function;
     function_assignmentst return_assignments;
     function_assignmentst param_assignments;
+    function_assignmentst exception_assignments;
   };
 
   // list_input_varst maps function identifiers onto a vector of [name = value]