[llvm] [bazel] Fix LLVM plugin tests under Analysis. (PR #142999)

[Chenguang Wang via llvm-commits]

wecing wrote:

> I'm not familiar w/ LLVM_ENABLE_PLUGINS, but if the tests pass, then sure?
> 
> FYI @chapuni who might know more about the failures

Thanks for the review. Since this only affects bazel and the tests were broken before, I feel this commit should be safe to submit.

It is currently 2AM in Japan so I don't think @chapuni will be able to respond soon. Let me submit this commit now to avoid other issues being hidden under it.

https://github.com/llvm/llvm-project/pull/142999