Test F2S+DSB-ETS

AArch64 F2S+DSB-ETS
{
[PTE(x)]=(valid:0);
0:X1=(oa:PA(x),valid:1);
0:X2=PTE(x); 0:X3=x;
1:X3=x
}

P0                 | P1               ;
   STR  X1,[X2]    |    MOV  W4,#2    ;
   DSB  ISH        |    LDR  W7, [X3] ;
   MOV W7,#1       | L0:STR  W4, [X3] ; 
   STR  W7,[X3]    |                  ;
exists (1:X7=1 /\ fault(P1:L0,x,MMU:Translation))