Test iriwv5

PPC iriwv5 (PPCIriwFive)
"iriw, one writer, barriers"
{
P0:r4=x ; P0:r5=y ;
P1:r4=x ; P1:r5=y ;
P2:r4=x ; P2:r5=y ;
P2:r1=1 ; P2:r2=2 ;
}

P0           |P1           |P2           ;
lwz r1,0(r4) |lwz r2,0(r5) |stw r1,0(r4) ;
lwsync       |lwsync       |lwsync       ;
lwz r2,0,r5  |lwz  r1,0,r4 |stw r2,0(r5) ;

exists (0:r1=0 /\ 0:r2=0 /\ 1:r1=0 /\ 1:r2=2 \/ 0:r1=0 /\ 0:r2=2 /\ 1:r1=0 /\ 1:r2=2 \/ 0:r1=1 /\ 0:r2=0 /\ 1:r1=0 /\ 1:r2=2 \/ 0:r1=1 /\ 0:r2=2 /\ 1:r1=0 /\ 1:r2=2)