EscapeSet(int reg,int size,EscapeState escState){
  regSet=new BitSet(size);
  regSet.set(reg);
  escape=escState;
  childSets=new ArrayList<EscapeSet>();
  parentSets=new ArrayList<EscapeSet>();
  replaceableArray=false;
}

EscapeSet ( int reg , int size , EscapeState escState ) { regSet = new BitSet ( size ) ; regSet . set ( reg ) ; escape = escState ; childSets = new ArrayList < EscapeSet > ( ) ; parentSets = new ArrayList < EscapeSet > ( ) ; replaceableArray = false ; }
constructs an instance of an escapeset
