Test S+rel+dep-csel-else

AArch64 S+rel+dep-csel-else
{
0:X1=x; 0:X3=y;
1:X0=y; 1:X3=x;
int z=0; 1:X5=z;
}
 P0           | P1               ;
 MOV W0,#2    | MOV W7,#1        ; 
 STR W0,[X1]  | LDR W4,[X5]      ;
 MOV W2,#1    | LDR W1,[X0]      ;
 STLR W2,[X3] | CMP W4,WZR       ;
              | CSEL W6,W1,W7,NE ;
              | STR W6,[X3]      ;
Observed
    x=2; 1:X1=1;