Test safe315

PPC safe315
"SyncdWW Rfe SyncsRW Rfe DpdR Fre"
Cycle=SyncdWW Rfe SyncsRW Rfe DpdR Fre
Relax=
Safe=Fre DpdR BCSyncsRW BCSyncdWW
{
0:r2=x;
1:r2=x; 1:r5=y;
2:r2=y; 2:r4=x;
}
 P0           | P1            | P2           ;
 lwz r1,0(r2) | lwz r1,0(r2)  | li r1,1      ;
 sync         | xor r3,r1,r1  | stw r1,0(r2) ;
 li r3,2      | lwzx r4,r3,r5 | sync         ;
 stw r3,0(r2) |               | li r3,1      ;
              |               | stw r3,0(r4) ;
exists
(x=2 /\ 0:r1=1 /\ 1:r1=2 /\ 1:r4=0)