G.R.R.M. has warned us to not assume that anybody is dead without seeing a body. (And, if there's a Red Priest around, death isn't a dealbreaker.)
If Sandor can survive his wounds from Brienne, and Arya can survive her wounds from the waif, and Jaime, Bronn and Jon can survive falling into deep water while wearing heavy garments and armor, Tormund and Beric can survive riding an ice avalanche down to ground level.
The Lord of Light didn't keep bringing Beric back just to let him die under a mountain of ice.
I don't actually care one way or another if Beric made it or not. I kinda like him, but wouldn't be too upset if he died. But Tormund though, I'd be so pissed. He's like one of the only two or three left of the characters I count as my favorites in the show that isn't dead.
I mean, I hope they're both alive, but if one of them has to die, I'd rather it be Beric than Tormund.