Test 2+2W+mfence+ponant+WT+WB

X86_64 2+2W+mfence+ponant+WT+WB
"MFencedWW Coe PodWWNaNT CoeNTNa"
MT=x:WT y:WB
Generator=diyone7 (version 7.56+02~dev)
Prefetch=0:x=F,0:y=W,1:y=F,1:x=W
Com=Co Co
Orig=MFencedWW Coe PodWWNaNT CoeNTNa
Align=
{
1:rax=x;
}
 P0          | P1                  ;
 movl $2,(x) | movl $2,(y)         ;
 mfence      | movl $1,%ebx        ;
 movl $1,(y) | movntil %ebx,(%rax) ;
exists (x=2 /\ y=2)