Test R+sync+po

Run R+sync+po in model, using ppcmem

PPC R+sync+po
"SyncdWW Wse PodWR Fre"
Cycle=Fre SyncdWW Wse PodWR
{
0:r2=x; 0:r4=y;
1:r2=y; 1:r4=x;
}
 P0           | P1           ;
 li r1,1      | li r1,2      ;
 stw r1,0(r2) | stw r1,0(r2) ;
 sync         | lwz r3,0(r4) ;
 li r3,1      |              ;
 stw r3,0(r4) |              ;
exists
(y=2 /\ 1:r3=0)