Test F2+DSB-ETS

AArch64 F2+DSB-ETS
{
[PTE(x)]=(db:0);
0:X1=(oa:PA(x),db:1);
0:X2=PTE(x); 0:X3=x;
1:X3=x
}

P0                 | P1               ;
   STR  X1,[X2]    |    MOV  W4,#1    ;
   DSB  ISH        |    STR  W4, [X3] ; (* new permissions *)
   LDR  W7,[X3]    | L0:STR  W4, [X3] ; (* old permissions *)
exists (0:X7=0 /\ fault(P1:L0,x,MMU:Permission)) \/ (0:X7=1 /\ fault(P1:L0,x,MMU:Permission))