Test LB+lwsync+addr+wsi

PPC LB+lwsync+addr+wsi
"LwSyncdRW Rfe DpAddrdW Wsi Rfe"
Prefetch=
Com=Rf Rf
Orig=LwSyncdRW Rfe DpAddrdW Wsi Rfe
{
0:r2=x; 0:r4=y;
1:r2=y; 1:r5=x;
}
 P0           | P1            ;
 lwz r1,0(r2) | lwz r1,0(r2)  ;
 lwsync       | xor r3,r1,r1  ;
 li r3,1      | li r4,1       ;
 stw r3,0(r4) | stwx r4,r3,r5 ;
              | li r6,2       ;
              | stw r6,0(r5)  ;
exists
(x=2 /\ 0:r1=2 /\ 1:r1=1)