Test safe307

PPC safe307
"SyncdWR Fre SyncsWW Rfe DpdR Fre"
Cycle=SyncdWR Fre SyncsWW Rfe DpdR Fre
Relax=
Safe=Fre SyncdWR DpdR BCSyncsWW
{
0:r2=x;
1:r2=x; 1:r5=y;
2:r2=y; 2:r4=x;
}
 P0           | P1            | P2           ;
 li r1,1      | lwz r1,0(r2)  | li r1,1      ;
 stw r1,0(r2) | xor r3,r1,r1  | stw r1,0(r2) ;
 sync         | lwzx r4,r3,r5 | sync         ;
 li r3,2      |               | lwz r3,0(r4) ;
 stw r3,0(r2) |               |              ;
exists
(x=2 /\ 1:r1=2 /\ 1:r4=0 /\ 2:r3=0)