[llvm] [OpenMP][FIX] Remove unsound omp_get_thread_limit deduplication (PR #79524)

[Joseph Huber via llvm-commits]

https://github.com/jhuber6 approved this pull request.

LG overall. Shouldn't need the `nonnull`, `nounwind`, or `noundef` attributes either.

https://github.com/llvm/llvm-project/pull/79524