[llvm] [llvm][Verifier] Ensure we can accept both `llvm.loop.unroll.full` and `llvm.loop.unroll.enable` metadata on the same loop (PR #182381)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

LGTM although wouldn't hurt to get another approver more familiar with loop metadata.

https://github.com/llvm/llvm-project/pull/182381