Problem 2
---------

        Observe the  dumps generated by Liveness  based pointer analysis
        pass in th following example :

        1) Does  the pointer  information `a->b'  hold at  the start  of
           function f?

        2) Does  the  pointer information  `a->b'  hold  at the  end  of
           function f?

        3) Does the  pointer information `a->b'  hold in main  after the
           call to function f?

Program
-------
        
        int **a,*b,c;
        void f()
        {
          int b;
          if(b>0)
          {
        	a = &b;
        	f();
        	a = *a;
          }
        }
        
        int main()
        {
          a = (int*) b;
          b = &c;
          f();
          printf("%d%d%d",a,b,c);
        }


Procedure 
---------

        1) Compile the test program with following command
           $(INSTALL)/bin/gcc -flipta -O2 -fdump-ipa-lipta test.c
        	
        2) Observe the *.lipta dump generated
        
        3) `livein' and `liveout' represent the liveness information at
           a  basic block. `mayin' and  `mayout' represent  the pointer
           information  of the  basic  block. Callstring represent  the
           various calling context reaching function `f'.