Test MP+dmb.sy+po-rfi

AArch64 MP+dmb.sy+po-rfi
"DMB.SYdWW Rfe PodRW Rfi Fre"
Cycle=Rfi Fre DMB.SYdWW Rfe PodRW
Prefetch=0:x=F,0:y=W,1:y=F,1:x=T
Com=Rf Fr
Orig=DMB.SYdWW Rfe PodRW Rfi Fre
{
0:X1=x; 0:X3=y;
1:X1=y; 1:X3=x;
}
 P0          | P1          ;
 MOV W0,#2   | LDR W0,[X1] ;
 STR W0,[X1] | MOV W2,#1   ;
 DMB SY      | STR W2,[X3] ;
 MOV W2,#1   | LDR W4,[X3] ;
 STR W2,[X3] |             ;
Observed
    x=2; 1:X4=2; 1:X0=1;