Test WRW+2W+po+ponaa+WC+WB

X86_64 WRW+2W+po+ponaa+WC+WB
"Rfe PodRW Coe PodWWNaA CoeANa"
MT=x:WC y:WB
Generator=diyone7 (version 7.56+02~dev)
Prefetch=1:x=F,1:y=W,2:y=F,2:x=W
Com=Rf Co Co
Orig=Rfe PodRW Coe PodWWNaA CoeANa
Align=
{
}
 P0          | P1            | P2             ;
 movl $2,(x) | movl (x),%eax | movl $2,(y)    ;
             | movl $1,(y)   | movl $1,%eax   ;
             |               | xchgl (x),%eax ;
exists (x=2 /\ y=2 /\ 1:rax=2 /\ 2:rax=0)