Test S+dataxp+dmb.sy

AArch64 S+dataxp+dmb.sy
"based on: PosWRXP DpDatadW Rfe DMB.SYdRW WsePX"
Prefetch=0:x=F,0:y=W,1:y=F,1:x=W
Com=Rf Ws
{ ok=1;
0:X0=x; 0:X6=y;
1:X1=y; 1:X3=x;
}
 P0              | P1          ;
 MOV W1,#2       | LDR W0,[X1] ;
 LDXR W2,[X0]    | DMB SY      ;
 STXR W3,W1,[X0] | MOV W2,#1   ;
 EOR W5,W3,W3    | STR W2,[X3] ;
 ADD W5,W5,#1    |             ;
 STR W5,[X6]     |             ;
exists
(x=2 /\ 0:X2=1 /\ 0:X3=0 /\ 1:X0=1)