At the Forum, U2 had the 1990s — when Bono was MacPhisto — on its mind

What to do after reviving the 1980s? How about resurrecting the 1990s?

That’s one way to look at U2’s recently launched Experience + Innocence tour, which the veteran Irish band brought to the Forum on Tuesday night for the first of two dates.

Ostensibly designed to support U2’s 2017 album, “Songs…