[clang] [llvm] [coro] Lower `llvm.coro.await.suspend.handle` to resume with tail call (PR #89751)

[Chuanqi Xu via cfe-commits]

================
@@ -1523,24 +1442,16 @@ struct SwitchCoroutineSplitter {
 
     createResumeEntryBlock(F, Shape);
     auto *ResumeClone =
-        createClone(F, ".resume", Shape, CoroCloner::Kind::SwitchResume);
+        createClone(F, ".resume", Shape, CoroCloner::Kind::SwitchResume, TTI);
     auto *DestroyClone =
-        createClone(F, ".destroy", Shape, CoroCloner::Kind::SwitchUnwind);
+        createClone(F, ".destroy", Shape, CoroCloner::Kind::SwitchUnwind, TTI);
     auto *CleanupClone =
-        createClone(F, ".cleanup", Shape, CoroCloner::Kind::SwitchCleanup);
+        createClone(F, ".cleanup", Shape, CoroCloner::Kind::SwitchCleanup, 
TTI);
 
     postSplitCleanup(*ResumeClone);
     postSplitCleanup(*DestroyClone);
     postSplitCleanup(*CleanupClone);
 
-    // Adding musttail call to support symmetric transfer.
-    // Skip targets which don't support tail call.
-    //
-    // FIXME: Could we support symmetric transfer effectively without musttail
----------------
ChuanqiXu9 wrote:

Maybe we need to remain the FIXME

https://github.com/llvm/llvm-project/pull/89751
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