Test R+clflushoptnant+mfence+WB+WB

X86_64 R+clflushoptnant+mfence+WB+WB
"ClFlushOptdWWNaNT CoeNTNa MFencedWR Fre"
MT=x:WB y:WB
Generator=diyone7 (version 7.56+02~dev)
Prefetch=0:x=F,0:y=W,1:y=F,1:x=T
Com=Co Fr
Orig=ClFlushOptdWWNaNT CoeNTNa MFencedWR Fre
Align=
{
0:rax=y;
}
 P0                  | P1            ;
 movl $1,(x)         | movl $2,(y)   ;
 clflushopt (x)      | mfence        ;
 movl $1,%ebx        | movl (x),%eax ;
 movntil %ebx,(%rax) |               ;
exists (1:rax=0 /\ [y]=2)