Roger Corman, the fabled “King of the B’s” producer and director who churned out low-budget genre films with breakneck speed and provided career boosts to young, untested talents like Jack Nicholson, Ron Howard, Peter Bogdanovich, Martin Scorsese, Francis Ford Coppola, Jonathan Demme, Gale Anne Hurd and James Cameron, has died. He was 98. The filmmaker,