Test R+CAS+DMBLD

AArch64 R+CAS+DMBLD
"PodWR Amo.Cas Coe DMB.SYdWR Fre"
{
0:X1=x; 0:X2=y;
1:X1=y; 1:X3=x;
}
P0             | P1          ;
MOV W0,#1      | MOV W0,#2   ;
STR W0,[X1]    | STR W0,[X1] ;
MOV W3,#0      | DMB SY      ;
MOV W4,#1      | LDR W2,[X3] ;
CAS W3,W4,[X2] |             ;
Observed
    y=2; 1:X2=0; 0:X3=0;