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

[via llvm-commits]

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zmodem wrote:

With my patch, some of these tests become less interesting. The class of problems arising from instructions between the resume and suspend doesn't exist with the new lowering. We could probably drop coro-split-musttail{5,6,7}.ll?

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