Test LB+isyncra+sync

Executions for behaviour: "0:r1=1 ; 1:r1=1 ; ok=1"

PPC LB+isyncra+sync
"ISyncdRWRA RfeAP SyncdRW RfePR"
Cycle=RfeAP SyncdRW RfePR ISyncdRWRA
Prefetch=
Com=Rf Rf
Orig=ISyncdRWRA RfeAP SyncdRW RfePR
{ ok=1;
0:r2=x; 0:r4=y; 0:r6=ok;
1:r2=y; 1:r4=x;
}
 P0               | P1           ;
 lwarx r1,r0,r2   | lwz r1,0(r2) ;
 isync            | sync         ;
 li r3,1          | li r3,1      ;
 lwarx %sta,r0,r4 | stw r3,0(r4) ;
 stwcx. r3,r0,r4  |              ;
 bne  Fail0       |              ;
 b   Exit0        |              ;
 Fail0:           |              ;
 li r5,0          |              ;
 stw r5,0(r6)     |              ;
 Exit0:           |              ;
Observed
    0:r1=1; 1:r1=1; ok=1;