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

[Jordan Rupprecht via llvm-commits]

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

I'm not familiar w/ LLVM_ENABLE_PLUGINS, but if the tests pass, then sure?

FYI @chapuni who might know more about the failures

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