Test RSV+FAIL+SIMPLE

PPC RSV+FAIL+SIMPLE
"store conditional by P0 must (?) fail"
{
0:r2=x; 0:r4=y;
}
P0              ;
lwarx r3,r0,r4  ;
li r5,1         ;
stwcx. r5,r0,r2 ;
~exists (x=1)