[llvm] [offload] Add early exit on plugin deinit when offloading is disabled (PR #134090)

[Joseph Huber via llvm-commits]

jhuber6 wrote:

The plugins shouldn't be initialized so it's just a few loops. I don't think the extra complexity is worthwhile just  to avoid a debug print, considering that most builds won't even have debugging in them.

https://github.com/llvm/llvm-project/pull/134090