Test S+dmb.sy+po

AArch64 S+dmb.sy+po
"DMB.SYdWW Rfe PodRW Wse"
Cycle=Rfe PodRW Wse DMB.SYdWW
Relax=
Safe=Rfe Wse PodRW DMB.SYdWW
Prefetch=0:x=F,0:y=W,1:y=F,1:x=W
Com=Rf Ws
Orig=DMB.SYdWW Rfe PodRW Wse
{
0:X1=x; 0:X3=y;
1:X1=y; 1:X3=x;
}
 P0          | P1          ;
 MOV W0,#2   | LDR W0,[X1] ;
 STR W0,[X1] | MOV W2,#1   ;
 DMB SY      | STR W2,[X3] ;
 MOV W2,#1   |             ;
 STR W2,[X3] |             ;
exists
(x=2 /\ 1:X0=1)