Test S+ponant+mfence+WT+WB

X86_64 S+ponant+mfence+WT+WB
"PodWWNaNT RfeNTNa MFencedRW Coe"
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=Rf Co
Orig=PodWWNaNT RfeNTNa MFencedRW Coe
Align=
{
0:rax=y;
}
 P0                  | P1            ;
 movl $2,(x)         | movl (y),%eax ;
 movl $1,%ebx        | mfence        ;
 movntil %ebx,(%rax) | movl $1,(x)   ;
exists (x=2 /\ 1:rax=1)