[clang] [llvm] [Pipelines] Do not run CoroSplit and CoroCleanup in LTO pre-link pipeline (PR #90310)

[Wei Wang via cfe-commits]

apolloww wrote:

OK, so Mono LTO backend pipeline does not have any coro passes. We can add coroutine passes to `buildLTODefaultPipeline`, but I am not sure how big the use case it is. For now, I'll limit the tuning to ThinLTO only. Will send an update soon.

https://github.com/llvm/llvm-project/pull/90310