[clang] [OpenMP] Fix OpenMP reduction segfault with non-copyable types and user initializers. (PR #219265)

[Zahira Ammarguellat via cfe-commits]

zahiraam wrote:

CI failed to check out the latest commit due to a GitHub ref propagation lag. Could someone re-trigger the failing job? @alexey-bataev do you have permission to trigger it?
Thanks.

https://github.com/llvm/llvm-project/pull/219265