[Tests] Distributed/NFC: Add a test-case for rdar://109207043

Author: xedin

test/Distributed/distributed_actor_thunk_doesnt_leak_class_arguments.swift

@@ -0,0 +1,38 @@
+// RUN: %target-swift-frontend-emit-module -emit-module-path %t/FakeDistributedActorSystems.swiftmodule -module-name FakeDistributedActorSystems -disable-availability-checking %S/Inputs/FakeDistributedActorSystems.swift
+// RUN: %target-swift-frontend -module-name no_to_arg_leaks -emit-irgen -disable-availability-checking -I %t 2>&1 %s | %IRGenFileCheck %s -check-prefix CHECK-%target-import-type
+
+// UNSUPPORTED: back_deploy_concurrency
+// REQUIRES: concurrency
+// REQUIRES: distributed
+
+// REQUIRES: CPU=x86_64 || CPU=arm64
+
+// UNSUPPORTED: OS=windows-msvc
+
+import Distributed
+import FakeDistributedActorSystems
+
+@available(SwiftStdlib 5.5, *)
+typealias DefaultDistributedActorSystem = FakeActorSystem
+
+final class SomeClass<T>: Sendable, Codable {
+  init() {}
+}
+
+distributed actor Greeter {
+  // CHECK-LABEL: define linkonce_odr hidden swifttailcc void @"$s15no_to_arg_leaks7GreeterC4takeyyAA9SomeClassCyxGYaKlFTETF"
+  // CHECK: [[ARG_REF:%.*]] = bitcast i8* {{.*}} to %T15no_to_arg_leaks9SomeClassC**
+  // CHECK: %toDestroy = load %T15no_to_arg_leaks9SomeClassC*, %T15no_to_arg_leaks9SomeClassC** [[ARG_REF]]
+  // CHECK-NEXT: call void bitcast (void (%swift.refcounted*)* @swift_release to void (%T15no_to_arg_leaks9SomeClassC*)*)(%T15no_to_arg_leaks9SomeClassC* %toDestroy)
+  distributed func take<T>(_: SomeClass<T>) {
+  }
+}
+
+func test() async throws {
+  let system = DefaultDistributedActorSystem()
+
+  let local = Greeter(actorSystem: system)
+  let ref = try Greeter.resolve(id: local.id, using: system)
+
+  try await ref.take(SomeClass<Int>())
+}