[llvm] [Coroutines] Don't assert if coro-early runs more than once (PR #134854)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

hmm I hadn't considered that you could run the output of ThinLTO pre-link optimization through the normal pipeline, that seems weird but I guess fine

sgtm

https://github.com/llvm/llvm-project/pull/134854