Test R+popx+po+SYS2

AArch64 R+popx+po+SYS2
"PodWWPX WseXP PodWR Fre"
Cycle=Fre PodWWPX WseXP PodWR
Relax=WseXP
Safe=Fre PodWW PodWR
Prefetch=0:x=F,0:y=W,1:y=F,1:x=T
Com=Ws Fr
Orig=PodWWPX WseXP PodWR Fre
{
0:X1=x; 0:X2=y;
1:X1=y; 1:X3=x;
}
 P0              | P1          ;
 MOV W0,#1       | MOV W0,#2   ;
 STR W0,[X1]     | STR W0,[X1] ;
 MOV W3,#1       | LDR W2,[X3] ;
 LDXR W4,[X2]    |             ;
 STXR W5,W3,[X2] |             ;
exists
(y=2 /\ 0:X5=0 /\ 0:X4=0 /\ 1:X2=0)