[llvm] [lldb][bazel] Add ObjectFileXCOFF plugin library to the Bazel overlay (PR #209747)

[David Young via llvm-commits]

youngd007 wrote:

I believe this needs to be rebased on top of https://github.com/llvm/llvm-project/pull/209761.  Will wait to see if that PR fixing bazel build is green and can land.

https://github.com/llvm/llvm-project/pull/209747