Test LB+popx+poxp+SYS2

AArch64 LB+popx+poxp+SYS2
"PodRWPX RfeXX PodRWXP Rfe"
Cycle=Rfe PodRWPX RfeXX PodRWXP
Relax=RfeXX
Safe=Rfe PodRW
Prefetch=0:x=F,0:y=W,1:y=F,1:x=W
Com=Rf Rf
Orig=PodRWPX RfeXX PodRWXP Rfe
{
0:X1=x; 0:X2=y;
1:X0=y; 1:X4=x;
}
 P0              | P1              ;
 LDR W0,[X1]     | LDXR W1,[X0]    ;
 MOV W3,#1       | STXR W2,W1,[X0] ;
 LDXR W4,[X2]    | MOV W3,#1       ;
 STXR W5,W3,[X2] | STR W3,[X4]     ;
exists
(y=1 /\ 0:X5=0 /\ 0:X0=1 /\ 0:X4=0 /\ 1:X2=0 /\ 1:X1=1)