[llvm] [OpenMPOpt] Emit poison, not undef, for placeholder global initializers (PR #217081)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

This looks fine to me, but what's the background for this change?

Poison in memory is still problematic until byte type implementation is complete. It's not relevant for these specific cases, I'm just wondering where this is going.

https://github.com/llvm/llvm-project/pull/217081