Test MP+dmb.sy+fri-rfi-ctrl-pos

AArch64 MP+dmb.sy+fri-rfi-ctrl-pos
"DMB.SYdWW Rfe Fri Rfi DpCtrldR PosRR Fre"
Cycle=Rfi DpCtrldR PosRR Fre DMB.SYdWW Rfe Fri
Relax=
Safe=Rfi Rfe Fri Fre PosRR DMB.SYdWW DpCtrldR
Prefetch=0:x=F,0:y=W,1:y=F,1:x=T
Com=Rf Fr
Orig=DMB.SYdWW Rfe Fri Rfi DpCtrldR PosRR Fre
{
0:X1=x; 0:X3=y;
1:X1=y; 1:X5=x;
}
 P0          | P1           ;
 MOV W0,#1   | LDR W0,[X1]  ;
 STR W0,[X1] | MOV W2,#2    ;
 DMB SY      | STR W2,[X1]  ;
 MOV W2,#1   | LDR W3,[X1]  ;
 STR W2,[X3] | CBNZ W3,LC00 ;
             | LC00:        ;
             | LDR W4,[X5]  ;
             | LDR W6,[X5]  ;
Observed
    y=2; x=1; 1:X6=0; 1:X4=1; 1:X3=2; 1:X0=1;
and y=2; x=1; 1:X6=0; 1:X4=1; 1:X3=2; 1:X0=0;
and y=1; x=1; 1:X6=0; 1:X4=1; 1:X3=2; 1:X0=0;