Test LB+rel+CSEL

AArch64 LB+rel+CSEL
{
0:X5=x; 0:X4=y;
1:X4=y; 1:X5=x;
}
P0           | P1                 ;
LDR W0,[X5]  | LDR W3,[X4]        ;
MOV W2,#1    | CMP W0,#0          ;
STLR W2,[X4] | MOV W1, #7         ;
             | CSEL W1, W1, W3, EQ;
             | STR W1,[X5]        ;
Observed
    1:X3=1; 0:X0=7;