Test MP+clflushoptnext+mfence+WB+WC

X86_64 MP+clflushoptnext+mfence+WB+WC
"ClFlushOptNextdWW Rfe MFencedRR Fre"
MT=x:WB y:WC
Generator=diyone7 (version 7.56+02~dev)
Prefetch=0:x=F,0:y=W,1:y=F,1:x=T
Com=Rf Fr
Orig=ClFlushOptNextdWW Rfe MFencedRR Fre
Align=
{
}
 P0             | P1            ;
 movl $1,(x)    | movl (y),%eax ;
 clflushopt (y) | mfence        ;
 movl $1,(y)    | movl (x),%ebx ;
exists (1:rax=1 /\ 1:rbx=0)