I'm about half and half on Croc's survival; I've got Slipknot pegged for the ignoble "do these explosive implants work?" death, Diablo for the heroic sacrifice death that really pisses Croc and the others off, and Deadshot and Boomerang as the two members who are re-incarcerated for later. I don't think Croc could die anything except a tragic death; he's clearly alive late in the film and I just feel they'll try and make him a combination of terrifying monster and sympathetic anti-villain at the same time. I kind of feel like Croc is more likely to die by committing suicide by superhero on Katana's blade than to just get stomped or crushed or shot by the main villain.
I'd prefer he either slip away after the climax, or be shown to be the most heavily injured Squad member, but still kicking to be part of the supporting cast in any Gotham films or Suicide Squad appearances.