[llvm] [LTO][Pipelines][Coro] Handle coroutines in LTO pipeline (PR #126168)

[Arthur Eubanks via llvm-commits]

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

this patch is a regression in the sense that now we run coroutine passes twice in FullLTO, but I think the coroutine passes are all idempotent so that should be ok, so I think landing this separately should be fine

https://github.com/llvm/llvm-project/pull/126168