LAS VEGAS – Believe the hype. Regardless of what happens at the multibillion-dollar Las Vegas behemoth following U2’s opening rush of shows over the next three months, the band’s “U2:UV Achtung Baby Live at Sphere” performance is a marvel. It’s IMAX meets the Death Star – with a lot of swagger, a head trip of artsy graphics and a trove of heartfelt songs. Especially since some of the most moving moments were in the small details and the inherent earnestness of U2’s music. More:U2 shocks Vegas fans with pop-up concert on Fremont Street ahead of MSG Sphere residency