Test R+po+poxx+SYS2

AArch64 R+po+poxx+SYS2
"PodWW WsePX PodWRXX FreXP"
Cycle=PodWW WsePX PodWRXX FreXP
Relax=WsePX FreXP
Safe=PodWW PodWR
Prefetch=0:x=F,0:y=W,1:y=F,1:x=T
Com=Ws Fr
Orig=PodWW WsePX PodWRXX FreXP
{
0:X1=x; 0:X3=y;
1:X0=y; 1:X4=x;
}
 P0          | P1              ;
 MOV W0,#1   | MOV W1,#2       ;
 STR W0,[X1] | LDXR W2,[X0]    ;
 MOV W2,#1   | STXR W3,W1,[X0] ;
 STR W2,[X3] | LDXR W5,[X4]    ;
             | STXR W6,W5,[X4] ;
exists
(x=1 /\ y=2 /\ 1:X6=0 /\ 1:X3=0 /\ 1:X2=1 /\ 1:X5=0)