[llvm] [LTO][Pipelines][Coro] De-duplicate Coro passes (PR #128654)

[Vincent Lee via llvm-commits]

thevinster wrote:

@vitalybuka @aeubanks This change appears to be breaking builds that use FatLTO. See [godbolt](https://godbolt.org/z/zrxqMPK7E) for a reproducer. When `-ffat-lto-objects` isn't enabled, the compilation works. Is it possible that the de-duplication has removed critical passes ran during the FatLTO pipeline? 

https://github.com/llvm/llvm-project/pull/128654