[clang] [llvm] [coroutine] Implement llvm.coro.await.suspend intrinsic (PR #79712)

[via cfe-commits]

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@@ -1744,6 +1744,273 @@ a call to ``llvm.coro.suspend.retcon`` after resuming abnormally.
 In a yield-once coroutine, it is undefined behavior if the coroutine
 executes a call to ``llvm.coro.suspend.retcon`` after resuming in any way.
 
+.. _coro.await.suspend:
+
+'llvm.coro.await.suspend' Intrinsic
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fpasserby wrote:

Renamed to `coro.await.suspend.void`

https://github.com/llvm/llvm-project/pull/79712