[clang] [llvm] [Support][IR] Set library options per LLVMContext (PR #231407)

[Reid Kleckner via cfe-commits]

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

Thanks!

I think we need this somewhat urgently because we need a per-context option storage solution upstream, now that our downstream one conflicts with recent changes.

https://github.com/llvm/llvm-project/pull/231407