[llvm] [Coro][WebAssembly] Add tail-call check for async lowering (PR #81481)

[Yuta Saito via llvm-commits]

kateinoigakukun wrote:

This PR is blocking Swift CI and this change only affects Swift with WebAssembly, so I think it's safe to merge this. Please let me know if you have any issues.

https://github.com/llvm/llvm-project/pull/81481