Test RWC+isb+dsb

ARM RWC+isb+dsb
"Rfe ISBdRR Fre DSBdWR Fre"
Cycle=Rfe ISBdRR Fre DSBdWR Fre
{
%x0=x;
%x1=x; %y1=y;
%y2=y; %x2=x;
}
 P0            | P1            | P2            ;
 MOV R0, #1    | LDR R0, [%x1] | MOV R0, #1    ;
 STR R0, [%x0] | ISB           | STR R0, [%y2] ;
               | LDR R1, [%y1] | DSB           ;
               |               | LDR R1, [%x2] ;
Observed
    1:R0=1; 1:R1=0; 2:R1=0;