* @return null because the correct state transitions are inserted by the policy, and the abstract
* interpreter should not be concerned.
*/
public MutableState call(MutableState s, int target_address) {
if ( isea != null ) {
ISEState rs = isea.getProcedureSummary(target_address);
if ( rs != null )
maskIrrelevantState(s, rs);
}
s.setPC(target_address);