Test LB+dmb.st+dmb.stal

AArch64 LB+dmb.st+dmb.stal
"DMB.STdRW RfePA DMB.STdRWAL RfeLP"
Cycle=RfePA DMB.STdRWAL RfeLP DMB.STdRW
Relax=
Safe=DMB.STdRW RfePA RfeLP
Prefetch=0:x=F,0:y=W,1:y=F,1:x=W
Com=Rf Rf
Orig=DMB.STdRW RfePA DMB.STdRWAL RfeLP
{
0:X1=x; 0:X3=y;
1:X1=y; 1:X3=x;
}
 P0          | P1           ;
 LDR W0,[X1] | LDAR W0,[X1] ;
 DMB ST      | DMB ST       ;
 MOV W2,#1   | MOV W2,#1    ;
 STR W2,[X3] | STLR W2,[X3] ;
Observed
    1:X0=1; 0:X0=1;