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

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zmodem wrote:

I wasn't able to figure out what this test does. There is a Clang level test which was added at the same time: llvm/test/Transforms/Coroutines/coro-preserve-final.ll presumable that's enough.

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