Test IRIW+syncs

Run IRIW+syncs in model, using ppcmem

PPC IRIW+syncs
"Rfe SyncdRR Fre Rfe SyncdRR Fre"
Cycle=Rfe SyncdRR Fre Rfe SyncdRR Fre
{
0:r2=x;
1:r2=x; 1:r4=y;
2:r2=y;
3:r2=y; 3:r4=x;
}
 P0           | P1           | P2           | P3           ;
 li r1,1      | lwz r1,0(r2) | li r1,1      | lwz r1,0(r2) ;
 stw r1,0(r2) | sync         | stw r1,0(r2) | sync         ;
              | lwz r3,0(r4) |              | lwz r3,0(r4) ;
~exists
(1:r1=1 /\ 1:r3=0 /\ 3:r1=1 /\ 3:r3=0)