Test propagate-sync-coherence

Run propagate-sync-coherence in model, using ppcmem

PPC propagate-sync-coherence
"propagate-sync-coherence"
{
0:r2=x;
1:r2=x; 1:r4=y;
2:r2=x;
3:r2=y; 3:r5=x;
}
 P0           | P1           | P2           | P3            ;
 li r1,1      | lwz r1,0(r2) | li r1,2      | lwz r1,0(r5)  ;
 stw r1,0(r2) | sync         | stw r1,0(r2) | xor r3,r1,r1  ;
              | li r5,1      |              | lwzx r4,r3,r2 ;
              | stw r5,0(r4) |              |               ;

exists (1:r1=1 /\ 3:r1=2 /\ 3:r4=1 /\ x=2)