Test LB+lwsync+data+wsi

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