[llvm] [Inline][WinEH] Fix try scopes leaking to caller on inline (PR #164170)

[via llvm-commits]

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@@ -2210,6 +2211,135 @@ inlineRetainOrClaimRVCalls(CallBase &CB, objcarc::ARCInstKind RVCallKind,
   }
 }
 
+// Determine SEH try scopes and order them by dominance.
+static SmallVector<llvm::InvokeInst *, 1>
+GetOrderedSehTryScopes(Function *Func, DominatorTree &DT) {
+  SmallVector<llvm::InvokeInst *, 1> Scopes{};
+  bool DTCalculated = false;
+
+  for (auto &BB : *Func) {
+    auto *TI = BB.getTerminator();
+    if (auto *II = dyn_cast<InvokeInst>(TI)) {
+      auto *Call = cast<CallBase>(II);
+      const auto *Fn = Call->getCalledFunction();
+      if (!Fn || !Fn->isIntrinsic())
+        continue;
+
+      if (Fn->getIntrinsicID() != Intrinsic::seh_try_begin)
+        continue;
+
+      if (!DTCalculated) {
+        DT.recalculate(*Func);
+        DTCalculated = true;
+      }
+
+      auto InsertIt = Scopes.end();
+      if (!Scopes.empty())
+        for (auto ScopeIt = Scopes.begin(); ScopeIt != Scopes.end(); ++ScopeIt)
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MuellerMP wrote:

removed this loop
should perform better now

https://github.com/llvm/llvm-project/pull/164170