[clang] [llvm] [mlir] Reapply "[Coroutines] Add llvm.coro.is_in_ramp and drop return value of llvm.coro.end #153404" (PR #155339)

[Weibo He via cfe-commits]

https://github.com/NewSigma closed 
https://github.com/llvm/llvm-project/pull/155339
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