[lld] [lldb] [llvm] Revert "[lit] cleanup unused imports" (PR #144054)

[Kirill Stoimenov via llvm-commits]

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

Original PR broke a bunch of Sanitizers bots: https://lab.llvm.org/buildbot/#/builders/85/builds/9827. I will merge that revert. 

https://github.com/llvm/llvm-project/pull/144054