Test MP+dmb.sy+pos-[fr-rf]-ctrl

AArch64 MP+dmb.sy+pos-[fr-rf]-ctrl
"DMB.SYdWW Rfe PosRR FrLeave RfBack DpCtrldR Fre"
Cycle=Rfe PosRR FrLeave RfBack DpCtrldR Fre DMB.SYdWW
Relax=
Safe=Rfe Fre PosRR DMB.SYdWW DpCtrldR [FrLeave,RfBack]
Prefetch=0:x=F,0:y=W,1:y=F,1:x=T
Com=Rf Fr Rf
Orig=DMB.SYdWW Rfe PosRR FrLeave RfBack DpCtrldR Fre
{
0:X1=x; 0:X3=y;
1:X1=y; 1:X5=x;
2:X1=y;
}
 P0          | P1           | P2          ;
 MOV W0,#1   | LDR W0,[X1]  | MOV W0,#2   ;
 STR W0,[X1] | LDR W2,[X1]  | STR W0,[X1] ;
 DMB SY      | LDR W3,[X1]  |             ;
 MOV W2,#1   | CBNZ W3,LC00 |             ;
 STR W2,[X3] | LC00:        |             ;
             | LDR W4,[X5]  |             ;
Observed
    y=2; x=1; 1:X4=0; 1:X3=2; 1:X2=1; 1:X0=0;