int128: Add int128_exts64()
This adds macro to extend signed 64bit value to signed 128bit value. Signed-off-by: NAlexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
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