[clang] [llvm] [coro] Lower `llvm.coro.await.suspend.handle` to resume with tail call (PR #89751)

[Mircea Trofin via cfe-commits]

mtrofin wrote:

Does this address https://discourse.llvm.org/t/coro-pre-split-handling-of-the-suspend-edge/75043? Could you add a note there in that direction - a few folks were looking at going at the direction @jyknight was suggesting there, and it'd be good to have closure on the topic.

https://github.com/llvm/llvm-project/pull/89751