[llvm] [Coroutines] properly update CallGraph in CoroSplit (PR #107935)

[Chuanqi Xu via llvm-commits]

================
@@ -2080,12 +2080,13 @@ splitCoroutine(Function &F, SmallVectorImpl<Function *> &Clones,
   return Shape;
 }
 
-static void updateCallGraphAfterCoroutineSplit(
+static LazyCallGraph::SCC &updateCallGraphAfterCoroutineSplit(
     LazyCallGraph::Node &N, const coro::Shape &Shape,
     const SmallVectorImpl<Function *> &Clones, LazyCallGraph::SCC &C,
     LazyCallGraph &CG, CGSCCAnalysisManager &AM, CGSCCUpdateResult &UR,
     FunctionAnalysisManager &FAM) {
----------------
ChuanqiXu9 wrote:

Can't we make the type of  `C` to `LazyCallGraph::SCC *&`?

https://github.com/llvm/llvm-project/pull/107935