Test MP+rel+dep-csel-else

AArch64 MP+rel+dep-csel-else
{
0:X1=x; 0:X3=y;
1:X0=y; 1:X2=x;
int z=1;
1:X5=z;
}
 P0           | P1                  ;
 MOV W0,#1    | LDR W1,[X0]         ;
 STR W0,[X1]  | LDR W4,[X5]         ;
 MOV W2,#1    | CMP W4,WZR          ;
 STLR W2,[X3] | CSEL W6,W1,WZR,EQ   ;
              | LDR W3,[X2,W6,SXTW] ;
Observed
    1:X3=0; 1:X1=1;