Test non-treelike-coherence

Run non-treelike-coherence in model, using ppcmem

PPC non-treelike-coherence
"Non-treelike coherence"
{
0:r2=x;
1:r2=x; 
2:r2=x;
3:r2=x;
4:r2=x;
}
 P0           | P1            | P2           | P3            | P4           ;
 li r1,1      | lwz r1,0(r2)  | li r1,2      | lwz r1,0(r2)  | li r1,3      ;
 stw r1,0(r2) | xor r3,r1,r1  | stw r1,0(r2) | xor r3,r1,r1  | stw r1,0(r2) ;
              | lwzx r4,r3,r2 |              | lwzx r4,r3,r2 |              ;
exists
(1:r1=1 /\ 1:r4=3 /\ 3:r1=2 /\ 3:r4=3 /\ x=3)