Test C11-C

AArch64 C11-C
"Example C from notes41"
{
0:X1=x;
1:X1=x; 1:X3=y;
2:X1=y; 2:X3=x;
}
 P0          | P1           | P2           ;
 MOV W0,#1   | MOV W0,#2    | LDAR W0,[X1] ;
 STR W0,[X1] | STR W0,[X1]  | LDR W2,[X3]  ;
             | MOV W2,#1    |              ;
             | STLR W2,[X3] |              ;
exists
(x=2 /\ 2:X0=1 /\ 2:X2=1)