qemu-common.h: optimise muldiv64 if int128 is available
Let compiler do the job to optimise the function. Signed-off-by: NFrediano Ziglio <frediano.ziglio@huawei.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NFrediano Ziglio <freddy77@gmail.com>
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