Test LB+isyncrp+sync

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