Test R+mfence+clflushopt+WB+WB

X86_64 R+mfence+clflushopt+WB+WB
"MFencedWW Coe ClFlushOptdWR 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=MFencedWW Coe ClFlushOptdWR Fre
Align=
{
}
 P0          | P1             ;
 movl $1,(x) | movl $2,(y)    ;
 mfence      | clflushopt (y) ;
 movl $1,(y) | movl (x),%eax  ;
exists (y=2 /\ 1:rax=0)