Test LB-ldxr-stxr-rel

AArch64 LB-ldxr-stxr-rel
{
0:X1=x; 0:X3=y; 0:X10=z;
1:X1=y; 1:X3=x;
}
 P0                 | P1           ;
 LDR W0,[X1]        | LDR W0,[X1]  ;
 LDXR W12,[X10]     | MOV W2,#1    ;
 STXR W11,W0,[X10]  | STLR W2,[X3] ;
 EOR W22, W12, W12  |              ;
 ADD W2, W22, #1    |              ;
 STR W2,[X3]        |              ;
Observed
    z=1; 1:X0=1; 0:X0=1;
and z=0; 1:X0=1; 0:X0=1;