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

[Chuanqi Xu via cfe-commits]

================
@@ -167,6 +167,47 @@ class CoroCloner {
 
 } // end anonymous namespace
 
+// FIXME:
+// Lower the intrinisc earlier if coroutine frame doesn't escape
----------------
ChuanqiXu9 wrote:

```suggestion
// Lower the intrinisc in CoroEarly phase if coroutine frame doesn't escape
```

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