[clang] Extend `retcon.once` coroutines lowering to optionally produce a normal result (PR #66333)

[Anton Korobeynikov via cfe-commits]

================
@@ -3046,7 +3046,8 @@ void coro::buildCoroutineFrame(
   // Collect the spills for arguments and other not-materializable values.
   for (Argument &A : F.args())
     for (User *U : A.users())
-      if (Checker.isDefinitionAcrossSuspend(A, U))
+      if (Checker.isDefinitionAcrossSuspend(A, U) ||
+          isa<CoroEndInst>(U))
----------------
asl wrote:

Ok, I'll give it a try. Note that this will be a C++ API breaking change though 
as we will always need to pass an extra argument.

https://github.com/llvm/llvm-project/pull/66333
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