Test LB+sync+po

PPC LB+sync+po
"SyncdRW Rfe PodRW Rfe"
Cycle=Rfe PodRW Rfe SyncdRW
Prefetch=
Com=Rf Rf
Orig=SyncdRW Rfe PodRW Rfe
{
0:r2=x; 0:r4=y;
1:r2=y; 1:r4=x;
}
 P0           | P1           ;
 lwz r1,0(r2) | lwz r1,0(r2) ;
 sync         | li r3,1      ;
 li r3,1      | stw r3,0(r4) ;
 stw r3,0(r4) |              ;
exists
(0:r1=1 /\ 1:r1=1)