Test R+popx+poxx+SYS2

AArch64 R+popx+poxx+SYS2
"PodWWPX WseXX PodWRXX FreXP"
Cycle=PodWWPX WseXX PodWRXX FreXP
Relax=FreXP WseXX
Safe=PodWW PodWR
Prefetch=0:x=F,0:y=W,1:y=F,1:x=T
Com=Ws Fr
Orig=PodWWPX WseXX PodWRXX FreXP
{
0:X1=x; 0:X2=y;
1:X0=y; 1:X4=x;
}
 P0              | P1              ;
 MOV W0,#1       | MOV W1,#2       ;
 STR W0,[X1]     | LDXR W2,[X0]    ;
 MOV W3,#1       | STXR W3,W1,[X0] ;
 LDXR W4,[X2]    | LDXR W5,[X4]    ;
 STXR W5,W3,[X2] | STXR W6,W5,[X4] ;
exists
(x=1 /\ y=2 /\ 0:X5=0 /\ 0:X4=0 /\ 1:X6=0 /\ 1:X3=0 /\ 1:X2=1 /\ 1:X5=0)