[perl #46689] [TODO] [C] Check parents when comparing an Exception object with itSELF

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# New Ticket Created by  Paul Cochrane 
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In src/pmc/exception.pmc:is_equal() there is the todo item (embedded in its
code):

    INTVAL is_equal(PMC *value) {
        if (value->vtable->base_type == enum_class_Exception ||
            VTABLE_isa(INTERP, value, const_string(INTERP, "Exception"))) {
            /* TODO check parents */
            return 1;
        }
        
        return 0;
    }

This check needs to be implemented.