Test LB+popxs+SYS2

AArch64 LB+popxs+SYS2
"PodRWPX RfeXP PodRWPX RfeXP"
Cycle=PodRWPX RfeXP PodRWPX RfeXP
Relax=RfeXP
Safe=PodRW
Prefetch=0:x=F,0:y=W,1:y=F,1:x=W
Com=Rf Rf
Orig=PodRWPX RfeXP PodRWPX RfeXP
{
0:X1=x; 0:X2=y;
1:X1=y; 1:X2=x;
}
 P0              | P1              ;
 LDR W0,[X1]     | LDR W0,[X1]     ;
 MOV W3,#1       | MOV W3,#1       ;
 LDXR W4,[X2]    | LDXR W4,[X2]    ;
 STXR W5,W3,[X2] | STXR W5,W3,[X2] ;
Observed
    y=1; x=1; 1:X5=0; 1:X4=0; 1:X0=1; 0:X5=0; 0:X4=0; 0:X0=1;