Test rich4

PPC rich4 (PPCRichFour)
{
0:r5=x ; 0:r6=y;
1:r5=x ; 1:r6=y;
1:r1=1 ; 1:r2=2;
}
P0           | P1          ;
lwz r1,0(r5) |stw r2,0(r6) ;
li r2,3      |lwsync       ;
xor r9,r1,r1 |             ;
stwx r2,r9,r6|stw r1,0(r5) ;
locations [0:r1; y;]
exists (true)