NEW YORK (Reuters) – Grammy-winning rapper Tone Loc reportedly collapsed on stage late Saturday night during a performance in Des Moines, Iowa. Amateur video posted Sunday on the Des Moines Register newspaper website showed several emergency personnel kneeling over a prone body on a stage at the Bridge Bash, a St. Patrick's Day concert featuring Loc and other hip hop artists. The condition of Loc, who was born Anthony Terrell Smith, was not known on Sunday. A representative did not immediately return a call for comment. …