[llvm] [Coroutines] ABI Objects to improve code separation between different ABIs, users and utilities. (PR #109338)

[Chuanqi Xu via llvm-commits]

================
@@ -2207,8 +2196,53 @@ static void addPrepareFunction(const Module &M,
     Fns.push_back(PrepareFn);
 }
 
+static coro::BaseABI *CreateNewABI(Function &F, coro::Shape &S) {
+  switch (S.ABI) {
+  case coro::ABI::Switch:
+    return new coro::SwitchABI(F, S);
+  case coro::ABI::Async:
+    return new coro::AsyncABI(F, S);
+  case coro::ABI::Retcon:
+    return new coro::AnyRetconABI(F, S);
+  case coro::ABI::RetconOnce:
+    return new coro::AnyRetconABI(F, S);
+  }
+  llvm_unreachable("Unknown ABI");
+}
+
 CoroSplitPass::CoroSplitPass(bool OptimizeFrame)
-    : MaterializableCallback(coro::defaultMaterializable),
+    : CreateAndInitABI([](Function &F, coro::Shape &S) {
+        coro::BaseABI *ABI = CreateNewABI(F, S);
+        ABI->init();
+        return ABI;
+      }),
+      OptimizeFrame(OptimizeFrame) {}
+
+static coro::BaseABI *
+CreateNewABIIsMat(Function &F, coro::Shape &S,
----------------
ChuanqiXu9 wrote:

```suggestion
CreateNewABI(Function &F, coro::Shape &S,
```

or make `IsMatCallback` a default argument

https://github.com/llvm/llvm-project/pull/109338