Test SyncWith2

PPC SyncWith2
"Synchornize with, 2 procs"
{
0:r2=x; 0:r4=y; 0:r5=z ;
1:r2=y; 1:r4=x; 1:r5=z ;
}
 P0           | P1           ;
 li r1,1      | lwz r6,0(r5) ;
 stw r1,0(r2) | cmpw r6,r6   ;
 stw r1,0(r4) | bne L1       ;
 lwsync       |L1:           ;
 stw r1,0(r5) | isync        ;
              | lwz r1,0(r2) ;
              | lwz r3,0(r4) ;
exists (1:r6=1 /\ 1:r1=1 /\ 1:r3=0)