Test LB+lwsync+porp

PPC LB+lwsync+porp
"LwSyncdRW RfePR PodRWRP Rfe"
Cycle=Rfe LwSyncdRW RfePR PodRWRP
Prefetch=
Com=Rf Rf
Orig=LwSyncdRW RfePR PodRWRP Rfe
{
0:r2=x; 0:r4=y;
1:r2=y; 1:r4=x;
}
 P0           | P1             ;
 lwz r1,0(r2) | lwarx r1,r0,r2 ;
 lwsync       | li r3,1        ;
 li r3,1      | stw r3,0(r4)   ;
 stw r3,0(r4) |                ;
exists
(0:r1=1 /\ 1:r1=1)